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c:ms:2025:schedule:w13.lecture.note [2025/06/02 00:08] – hkimscilc:ms:2025:schedule:w13.lecture.note [2025/06/08 23:51] (current) – [output] hkimscil
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 # #
 rm(list=ls()) rm(list=ls())
-d <- read.csv("http://commres.net/wiki/_media/regression01-bankaccount.csv")  +df <- read.csv("http://commres.net/wiki/_media/regression01-bankaccount.csv")  
-d+df
  
-colnames(d) <- c("y", "x1", "x2") +colnames(df) <- c("y", "x1", "x2") 
-d+df
 # y = 통장갯수 # y = 통장갯수
 # x1 = 인컴 # x1 = 인컴
 # x2 = 부양가족수  # x2 = 부양가족수 
-lm.y.x1 <- lm(y ~ x1, data=d)+lm.y.x1 <- lm(y ~ x1, data=df)
 summary(lm.y.x1) summary(lm.y.x1)
 anova(lm.y.x1) anova(lm.y.x1)
 +cor(df$x1, df$y)^2
 +summary(lm.y.x1)$r.squared
  
-lm.y.x2 <- lm(y ~ x2, data=d)+ 
 +lm.y.x2 <- lm(y ~ x2, data=df)
 summary(lm.y.x2) summary(lm.y.x2)
 anova(lm.y.x2) anova(lm.y.x2)
 +cor(df$x2, df$y)^2
 +summary(lm.y.x2)$r.squared
  
-lm.y.x1x2 <- lm(y ~ x1+x2, data=d)+ 
 +lm.y.x1x2 <- lm(y ~ x1+x2, data=df)
 summary(lm.y.x1x2) summary(lm.y.x1x2)
 anova(lm.y.x1x2) anova(lm.y.x1x2)
 +bcd <- summary(lm.y.x1x2)$r.squared
 +bcd
 +bc.cd <- summary(lm.y.x1)$r.squared + summary(lm.y.x2)$r.squared
 +bc.cd
 +bc.cd - bcd  # note that this is the amount that shared by the two IVs
 +
  
 lm.y.x1x2$coefficient lm.y.x1x2$coefficient
-# y.hat = 6.399103 + (0.01184145)*x1 + (−0.54472725)*x2 +# y.hat = 6.399103 + (0.01184145)*x1 + (?0.54472725)*x2 
 a <- lm.y.x1x2$coefficient[1] a <- lm.y.x1x2$coefficient[1]
 b1 <- lm.y.x1x2$coefficient[2] b1 <- lm.y.x1x2$coefficient[2]
Line 34: Line 46:
 b2  b2 
  
-y.pred <- a + (b1 * x1) + (b2 * x2)+y.pred <- a + (b1 * df$x1) + (b2 * df$x2)
 y.pred  y.pred 
 # or  # or 
Line 40: Line 52:
 head(y.pred == y.pred2) head(y.pred == y.pred2)
  
-y.real <- y+y.real <- df$y
 y.real y.real
-y.mean <- mean(y)+y.mean <- mean(df$y)
 y.mean  y.mean 
  
 +deviation.score <- df$y - y.mean
 +ds <- deviation.score
 res <- y.real - y.pred res <- y.real - y.pred
 reg <- y.pred - y.mean reg <- y.pred - y.mean
Line 50: Line 64:
 # remember y is sum of res + reg + y.mean # remember y is sum of res + reg + y.mean
 y2 <- res + reg + y.mean y2 <- res + reg + y.mean
-y==y2+df$y==y2
  
 +ss.tot <- sum(ds^2)
 ss.res <- sum(res^2) ss.res <- sum(res^2)
 ss.reg <- sum(reg^2) ss.reg <- sum(reg^2)
  
-ss.tot <- var(y) * (length(y)-1)+ss.tot2 <- var(df$y) * (length(df$y)-1)
 ss.tot ss.tot
 +ss.tot2
 ss.res ss.res
 ss.reg ss.reg
Line 62: Line 78:
  
 k <- 3 # # of parameters a, b1, b2 k <- 3 # # of parameters a, b1, b2
-df.tot <- length(y)-1+df.tot <- length(df$y)-1
 df.reg <- k - 1 df.reg <- k - 1
 df.res <- df.tot - df.reg df.res <- df.tot - df.reg
Line 78: Line 94:
 summary(lm.y.x1x2) summary(lm.y.x1x2)
 anova(lm.y.x1x2) anova(lm.y.x1x2)
 +
 +summary(lm(y~x2+x1, data=df))
 +anova(lm(y~x2+x1, data=df))
 +
 # note on 2 t-tests in summary # note on 2 t-tests in summary
 # anova에서의 x1, x2에 대한 테스트와  # anova에서의 x1, x2에 대한 테스트와 
Line 89: Line 109:
 # 테스트하기 때문에 그러함 # 테스트하기 때문에 그러함
  
 +# 또한 anova test에서 두번째 IV의 F값은 
 +# summary(lm)에서 두번 째 IV의 t값의 제곱값
 +# 임을 이해. 이는 두번 째 IV의 설명력을 나
 +# 타내는 부분이 lm과 anova 모두 같기 때문
 +# 반면에 첫번째 IV의 경우에는 lm 분석 때에는
 +# 고유의 설명력만을 가지고 (semi-partial cor^2)
 +# 판단을 하는 반면에, anova는 x2와 공유하는 
 +# 설명력도 포함해서 분석하기 때문에 t값의
 +# 제곱이 F값이 되지 못함
 +
 +# beta에 대한 설명
 # beta coefficient (standardized b) # beta coefficient (standardized b)
 # beta <- b * (sd(x)/sd(y)) # beta <- b * (sd(x)/sd(y))
-beta1 <- b1 * (sd(x1)/sd(y)) +beta1 <- b1 * (sd(df$x1)/sd(df$y)) 
-beta2 <- b2 * (sd(x2)/sd(y))+beta2 <- b2 * (sd(df$x2)/sd(df$y))
 beta1 beta1
 beta2 beta2
Line 105: Line 136:
 # understand with diagrams first # understand with diagrams first
 # then calculate with r # then calculate with r
-lm.tmp.1 <- lm(x2~x1, data=d)+lm.tmp.1 <- lm(x2~x1, data=df)
 res.x2.x1 <- lm.tmp.1$residuals res.x2.x1 <- lm.tmp.1$residuals
  
-lm.tmp.2 <- lm(y~x1, data=d)+lm.tmp.2 <- lm(y~x1, data=df)
 res.y.x1 <- lm.tmp.2$residuals res.y.x1 <- lm.tmp.2$residuals
  
-lm.tmp.3 <- lm(res.y.x1 ~ res.x2.x1, data=d)+lm.tmp.3 <- lm(res.y.x1 ~ res.x2.x1, data=df)
 summary(lm.tmp.3) summary(lm.tmp.3)
 +summary(lm.tmp.3)$r.squared 
 +sqrt(summary(lm.tmp.3)$r.squared)
 # install.packages("ppcor") # install.packages("ppcor")
 library(ppcor) library(ppcor)
-partial.r <- pcor.test(y, x2, x1) +partial.r <- pcor.test(df$y, df$x2, df$x1)
-partial.r+
 str(partial.r) str(partial.r)
 +partial.r$estimate
 summary(lm.tmp.3) summary(lm.tmp.3)
 summary(lm.tmp.3)$r.square summary(lm.tmp.3)$r.square
Line 125: Line 157:
  
 # x1's own explanation? # x1's own explanation?
-lm.tmp.4 <- lm(x1~x2, data=d)+lm.tmp.4 <- lm(x1~x2, data=df)
 res.x1.x2 <- lm.tmp.4$residuals res.x1.x2 <- lm.tmp.4$residuals
  
-lm.tmp.5 <- lm(y~x2, data=d)+lm.tmp.5 <- lm(y~x2, data=df)
 res.y.x2 <- lm.tmp.5$residuals res.y.x2 <- lm.tmp.5$residuals
  
-lm.tmp.6 <- lm(res.y.x2 ~ res.x1.x2, data=d)+lm.tmp.6 <- lm(res.y.x2 ~ res.x1.x2, data=df)
 summary(lm.tmp.6) summary(lm.tmp.6)
  
-partial.r <- pcor.test(y, x1, x2)+partial.r <- pcor.test(df$y, df$x1, df$x2)
 str(partial.r) str(partial.r)
 partial.r$estimate # this is partial correlation, not pr^2 partial.r$estimate # this is partial correlation, not pr^2
 # in order to get pr2, you should ^2 # in order to get pr2, you should ^2
 partial.r$estimate^2 partial.r$estimate^2
 +summary(lm.tmp.6)$r.squared
  
 ####################################################### #######################################################
-# 
 # semipartial correlation coefficient and spr2 # semipartial correlation coefficient and spr2
 # #
-spr.1 <- spcor.test(y,x2,x1) +spr.y.x2.x1 <- spcor.test(df$y,df$x2,df$x1) 
-spr.2 <- spcor.test(y,x1,x2) +spr.y.x1.x2 <- spcor.test(df$y,df$x1,df$x2) 
-spr.1 +spr.y.x2.x1 
-spr.2 +spr.y.x1.x2 
-spr.1$estimate^2 +spr2.y.x2.x1 <- spr.y.x2.x1$estimate^2 
-spr.2$estimate^2+spr2.y.x1.x2 <- spr.y.x1.x2$estimate^2 
 +spr2.y.x2.x1  
 +spr2.y.x1.x2 
  
-lm.tmp.7 <- lm(y ~ res.x2.x1, data = d)+lm.tmp.7 <- lm(y ~ res.x2.x1, data=df)
 summary(lm.tmp.7) summary(lm.tmp.7)
-spr.1$estimate^2+spr2.y.x2.x1 
  
-lm.tmp.8 <- lm(y~res.x1.x2, data = d)+lm.tmp.8 <- lm(y~res.x1.x2, data=df)
 summary(lm.tmp.8) summary(lm.tmp.8)
-spr.2$estimate^2+spr2.y.x1.x2  
 + 
 +bcd # remember bcd in the above? 
 +bd <- spr2.y.x2.x1 + spr2.y.x1.x2  
 +bd 
 +bcd - bd
  
 ####################################################### #######################################################
Line 164: Line 203:
 summary(lm.y.x2) summary(lm.y.x2)
 all.x2 <- summary(lm.y.x2)$r.squared all.x2 <- summary(lm.y.x2)$r.squared
-sp.x2 <- spr.1$estimate^2 
 all.x2 all.x2
-sp.x2 +spr2.y.x2.x1 
-cma.1 <- all.x2 - sp.x2+cma.1 <- all.x2 - spr2.y.x2.x1
 cma.1 cma.1
  
Line 173: Line 211:
 summary(lm.y.x1) summary(lm.y.x1)
 all.x1 <- summary(lm.y.x1)$r.squared all.x1 <- summary(lm.y.x1)$r.squared
-sp.x1 <- spr.2$estimate^2 
 all.x1 all.x1
-sp.x1 +spr2.y.x1.x2 
-cma.2 <- all.x1 - sp.x1+cma.2 <- all.x1 - spr2.y.x1.x2
 cma.2 cma.2
  
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 r2.y.x1x2 <- summary(lm.y.x1x2)$r.square r2.y.x1x2 <- summary(lm.y.x1x2)$r.square
 r2.y.x1x2 r2.y.x1x2
-sp.x1 +spr2.y.x1.x2 
-sp.x2 +spr2.y.x2.x1 
-cma.3 <- r2.y.x1x2 - (sp.x1 + sp.x2)+cma.3 <- r2.y.x1x2 - (spr2.y.x1.x2 + spr2.y.x2.x1) 
 +bcd - bd
 cma.3 cma.3
  
Line 195: Line 233:
 # regression에서 얻은 R2을 가지고  # regression에서 얻은 R2을 가지고 
 # 공통설명력을 알아볼 수도 있었다. # 공통설명력을 알아볼 수도 있었다.
-r2.x1 <- summary(lm.y.x1)$r.square +r2.y.x1 <- summary(lm.y.x1)$r.square 
-r2.x2 <- summary(lm.y.x2)$r.square +r2.y.x2 <- summary(lm.y.x2)$r.square 
-r2.x1x2 <- summary(lm.y.x1x2)$r.square +r2.y.x1 
-r2.x1 + r2.x2 - r2.x1x2+r2.y.x2 
 +r2.y.x1x2 <- summary(lm.y.x1x2)$r.square 
 +r2.y.x1x2 
 +cma.4 <- r2.y.x1 + r2.y.x2 - r2.y.x1x2 
 +cma.4
  
 # Note that sorting out unique and common # Note that sorting out unique and common
Line 209: Line 251:
 ############################################# #############################################
  
-############################################# 
-# scratch  
-############################################# 
-lm.x1x2 <- lm(x1~x2, data = d) 
-lm.x2x1 <- lm(x2~x1, data = d) 
  
-summary(lm.y.x1) +</code> 
-summary(lm.y.x2) +====== output ====== 
-summary(lm.y.x1x2)+<code> 
 +> # multiple regression: a simple e.g. 
 +> # 
 +> # 
 +> rm(list=ls()) 
 +> df <- read.csv("http://commres.net/wiki/_media/regression01-bankaccount.csv")  
 +> df 
 +   bankaccount income famnum 
 +1            6    220      5 
 +2            5    190      6 
 +3            7    260      3 
 +4            7    200      4 
 +5            8    330      2 
 +6           10    490      4 
 +7            8    210      3 
 +8           11    380      2 
 +9            9    320      1 
 +10           9    270      3 
 +>  
 +> colnames(df) <- c("y", "x1", "x2") 
 +> df 
 +    y  x1 x2 
 +1   6 220  5 
 +2   5 190  6 
 +3   7 260  3 
 +4   7 200  4 
 +5   8 330  2 
 +6  10 490  4 
 +7   8 210  3 
 +8  11 380  2 
 +9   9 320  1 
 +10  9 270  3 
 +> # y = 통장갯수 
 +> # x1 = 인컴 
 +> # x2 = 부양가족수  
 +> lm.y.x1 <- lm(y ~ x1, data=df) 
 +> summary(lm.y.x1)
  
-resx1 <- lm.x1x2$residuals +Call: 
-regx1 <- lm.x1x2$fitted.values-mean(x1) +lm(formula = y ~ x1, data = df)
-lm.y.resx1 <- lm(y~resx1, data = d) +
-summary(lm.y.resx1) # 0.3189 no sig. +
-lm.y.regx1 <- lm(y~regx1, data = d) +
-summary(lm.y.regx1) # 0.4793, p = .027;  +
-# but, this is 100% correlated part with x2 +
-summary(lm.y.x2) +
-cor(regx1,x2) # 1 +
-cor(resx1,x2) # 0+
  
-resx2 <- lm.x2x1$residuals +Residuals: 
-regx2 <- lm.x2x1$fitted.values-mean(x2) +   Min     1Q Median     3Q    Max  
-lm.y.resx2 <- lm(y~resx2, data = d) +-1.519 -0.897 -0.130  1.006  1.580 
-summary(lm.y.resx2) +
-lm.y.regx2 <- lm(y~regx2, data = d) +
-summary(lm.y.regx2) +
-summary(lm.y.x1)+
  
-cor(regx2,x1) # 1 because of this  +Coefficients: 
-cor(resx2,x1) # 0 +            Estimate Std. Error t value Pr(>|t|)    
-# the below two are the same  +(Intercept)  3.61778    1.24152    2.91    0.019 *  
-summary(lm(y~x1, data = d)) +x1           0.01527    0.00413    3.70    0.006 ** 
-summary(lm(y~regx2, data = d))+--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
  
-summary(lm(y~x2, data = d)) # 0.4793 +Residual standard error: 1.18 on 8 degrees of freedom 
-summary(lm(y~x1, data = d)) # 0.6311 +Multiple R-squared:  0.631, Adjusted R-squared:  0.585  
-summary(lm(y~resx1, data = d)) # 0.3189 +F-statistic: 13.7 on 1 and 8 DF,  p-value: 0.00605
-summary(lm(y~x1+x2, data = d))+
  
-summary(lm(y~x1, data = d))$r.square  +> anova(lm.y.x1) 
-summary(lm(y~resx1, data = d))$r.square +Analysis of Variance Table
-summary(lm(y~x1, data = d))$r.square - summary(lm(y~resx1, data = d))$r.square+
  
-sqrt(summary(lm(y~resx1, data = d))$r.square) +Response: y 
-spcor.test(y,x1,x2)+          Df Sum Sq Mean Sq F value Pr(>F)    
 +x1         1   18.9   18.93    13.7  0.006 ** 
 +Residuals  8   11.1    1.38                   
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 +> cor(df$x1, df$y)^2 
 +[1] 0.6311 
 +> summary(lm.y.x1)$r.squared 
 +[1] 0.6311 
 +>  
 +>  
 +> lm.y.x2 <- lm(y ~ x2, data=df) 
 +> summary(lm.y.x2)
  
-sqrt(summary(lm(y~x1, data = d))$r.square  +Call: 
-     - summary(lm(y~resx1, data = d))$r.square) +lm(formula = y ~ x2, data = df)
-(summary(lm(x1~x2, data =d))$r.square) +
-(summary(lm(y~x1, data = d))$r.square - summary(lm(y~resx1, data = d))$r.square) +
  
-a <- summary(lm(y~resx1, data = d))$r.square +Residuals: 
-c <- summary(lm(y~x1, data = d))$r.square +   Min     1Q Median     3Q    Max  
-b <- summary(lm(y~regx1, data = d))$r.square+-1.254 -0.888 -0.485  0.496  2.592 
  
-summary(lm(y~resx1, data = d)) +Coefficients: 
-summary(lm(y~resx2, data = d)) +            Estimate Std. Error t value Pr(>|t|)     
-summary(lm(y~x1, data = d)) +(Intercept)   10.791      1.119    9.64  1.1e-05 *** 
-summary(lm(y~x2, data = d))+x2            -0.846      0.312   -2.71    0.027 *   
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
  
-cor(regx2, x1) +Residual standard error: 1.4 on 8 degrees of freedom 
-cor(regx1, x2)+Multiple R-squared:  0.479, Adjusted R-squared:  0.414  
 +F-statistic: 7.36 on 1 and 8 DF,  p-value: 0.0265
  
-ab <- summary(lm(y~x1, data = d))$r.square   +> anova(lm.y.x2) 
-a <- summary(lm(y~resx1, data = d))$r.square +Analysis of Variance Table
-ab +
-a +
-ab-a+
  
-bc <- summary(lm(y~x2, data = d))$r.square   +Response: y 
-c <- summary(lm(y~resx2, data = d))$r.square +          Df Sum Sq Mean Sq F value Pr(>F)   
-bc +x2         1   14.4   14.38    7.36  0.027 * 
-c +Residuals  8   15.6    1.95                  
-bc-c +--- 
-ab-a+Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 +> cor(df$x2, df$y)^2 
 +[1] 0.4793 
 +> summary(lm.y.x2)$r.squared 
 +[1] 0.4793 
 +>  
 +>  
 +> lm.y.x1x2 <- lm(y ~ x1+x2, data=df) 
 +> summary(lm.y.x1x2)
  
-abc <- summary(lm(y~x1+x2, data = d))$r.square   +Call: 
-abc +lm(formula = y ~ x1 + x2, data = df)
-a +
-c +
-bc +
-a+(bc-c)+c +
-a+bc +
-ab+c+
  
-summary(lm(y~regx2+regx1, data = d))+Residuals: 
 +   Min     1Q Median     3Q    Max  
 +-1.217 -0.578 -0.151  0.664  1.191 
  
-summary(lm(y~x1+x2, data = d)) +Coefficients: 
-summary(lm(y~resx1+resx2, data = d))+            Estimate Std. Error t value Pr(>|t|)    
 +(Intercept)  6.39910    1.51654    4.22   0.0039 ** 
 +x1           0.01184    0.00356    3.33   0.0127 *  
 +x2          -0.54473    0.22636   -2.41   0.0470 *  
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
  
-summary(lm(y~resx1, data =d)) +Residual standard error: 0.93 on 7 degrees of freedom 
-summary(lm(y~resx2, data =d)) +Multiple R-squared:  0.798, Adjusted R-squared:  0.74  
-cor(resx1,resx2) +F-statistic: 13.8 on 2 and 7 DF,  p-value: 0.0037
-cor(x1,x2)+
  
-spcor.test(y,resx1,resx2)$estimate^2 +> anova(lm.y.x1x2) 
-spcor.test(y,resx2,resx1)$estimate^2+Analysis of Variance Table
  
-cor(y,x1)^2 +Response: y 
-cor(y,x2)^2+          Df Sum Sq Mean Sq F value Pr(>F)    
 +x1         1  18.93   18.93   21.88 0.0023 ** 
 +x2         1   5.01    5.01    5.79 0.0470 *  
 +Residuals  7   6.06    0.87                   
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 +> bcd <- summary(lm.y.x1x2)$r.squared 
 +> bcd 
 +[1] 0.7981 
 +> bc.cd <- summary(lm.y.x1)$r.squared + summary(lm.y.x2)$r.squared 
 +> bc.cd 
 +[1] 1.11 
 +> bc.cd - bcd  # note that this is the amount that shared by the two IVs 
 +[1] 0.3123 
 +>  
 +>  
 +> lm.y.x1x2$coefficient 
 +(Intercept)          x1          x2  
 +    6.39910     0.01184    -0.54473  
 +> # y.hat = 6.399103 + (0.01184145)*x1 + (?0.54472725)*x2  
 +> a <- lm.y.x1x2$coefficient[1] 
 +> b1 <- lm.y.x1x2$coefficient[2] 
 +> b2 <- lm.y.x1x2$coefficient[3] 
 +> a 
 +(Intercept)  
 +      6.399  
 +> b1 
 +     x1  
 +0.01184  
 +> b2  
 +     x2  
 +-0.5447  
 +>  
 +> y.pred <- a + (b1 * df$x1) + (b2 * df$x2) 
 +> y.pred  
 + [1]  6.281  5.381  7.844  6.588  9.217 10.023  7.252  9.809  9.644  7.962 
 +> # or  
 +> y.pred2 <- predict(lm.y.x1x2) 
 +> head(y.pred == y.pred2) 
 +   1    2    3    4    5    6  
 +TRUE TRUE TRUE TRUE TRUE TRUE  
 +>  
 +> y.real <- df$y 
 +> y.real 
 + [1]  6  5  7  7  8 10  8 11  9  9 
 +> y.mean <- mean(df$y) 
 +> y.mean  
 +[1] 8 
 +>  
 +> deviation.score <- df$y - y.mean 
 +> ds <- deviation.score 
 +> res <- y.real - y.pred 
 +> reg <- y.pred - y.mean 
 +> y.mean  
 +[1] 8 
 +> # remember y is sum of res + reg + y.mean 
 +> y2 <- res + reg + y.mean 
 +> df$y==y2 
 + [1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE 
 +>  
 +> ss.tot <- sum(ds^2) 
 +> ss.res <- sum(res^2) 
 +> ss.reg <- sum(reg^2) 
 +>  
 +> ss.tot2 <- var(df$y) * (length(df$y)-1) 
 +> ss.tot 
 +[1] 30 
 +> ss.tot2 
 +[1] 30 
 +> ss.res 
 +[1] 6.056 
 +> ss.reg 
 +[1] 23.94 
 +> ss.res+ss.reg 
 +[1] 30 
 +>  
 +> k <- 3 # # of parameters a, b1, b2 
 +> df.tot <- length(df$y)-1 
 +> df.reg <- k - 1 
 +> df.res <- df.tot - df.reg 
 +>  
 +> ms.reg <- ss.reg/df.reg 
 +> ms.res <- ss.res/df.res 
 +> ms.reg 
 +[1] 11.97 
 +> ms.res 
 +[1] 0.8652 
 +> f.val <- ms.reg/ms.res 
 +> f.val 
 +[1] 13.84 
 +> p.val <- pf(f.val, df.reg, df.res, lower.tail = F) 
 +> p.val 
 +[1] 0.003696 
 +>  
 +> # double check  
 +> summary(lm.y.x1x2)
  
-cor(y,resx1)^2 +Call: 
-cor(y,resx2)^2 +lm(formula = y ~ x1 + x2, data = df)
-   +
-spcor.test(y,x1,x2)$estimate^2 +
-spcor.test(y,x2,x1)$estimate^2+
  
-##############################################+Residuals: 
 +   Min     1Q Median     3Q    Max  
 +-1.217 -0.578 -0.151  0.664  1.191 
  
-# install.packages("lavann") +Coefficients: 
-library(lavaan)+            Estimate Std. Error t value Pr(>|t|)    
 +(Intercept)  6.39910    1.51654    4.22   0.0039 ** 
 +x1           0.01184    0.00356    3.33   0.0127 *  
 +x2          -0.54473    0.22636   -2.41   0.0470 *  
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
  
-specmod <- " +Residual standard error: 0.93 on 7 degrees of freedom 
-    # path c +Multiple R-squared:  0.798, Adjusted R-squared:  0.74  
-    # identifying path c (prime) by putting c* +F-statistic: 13.8 on 2 and 7 DF,  p-value: 0.0037
-    y ~ c*x2+
  
-    # path a +> anova(lm.y.x1x2) 
-    x1 ~ a*x2+Analysis of Variance Table
  
-    # path b  +Response: y 
-    y ~ b*x1 +          Df Sum Sq Mean Sq F value Pr(>F)    
-     +x1         1  18.93   18.93   21.88 0.0023 ** 
-    # indirect effect (a*b): Sobel test (Delta Method) +x2         1   5.01    5.01    5.79 0.0470 *  
-    # 간접효과 a path x b path 를 구해서 얻음 +Residuals  7   6.06    0.87                   
-    # sobel test 라 부름 +--- 
-    ab := a*b +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
-" +>  
-# Fit/estimate the model +> summary(lm(y~x2+x1, data=df))
-fitmod <- sem(specmod, data=d) +
-# summarize the model +
-summary(fitmod, fit.measures=TRUE, rsquare=T)+
  
-summary(lm(x2~x1, data = d)) +Call: 
-summary(lm(y~resx2, data = d)) +lm(formula = y ~ x2 + x1, data = df)
-summary(lm(y~x1, data = d)) +
-summary(lm(y~x2, data =d)) +
-############################################# +
-# e.g. 2 +
-############################################# +
-d.yyk <- read.csv("http://commres.net/wiki/_media/d.yyk.csv") +
-d.yyk +
-d.yyk <- subset(d.yyk, select = -c(1)) +
-d.yyk+
  
-attach(d.yyk) +Residuals: 
-lm.happiness.bmistress <- lm(happiness ~ bmi + stress, data=d.yyk) +   Min     1Q Median     3Q    Max  
-summary(lm.happiness.bmistress) +-1.217 -0.578 -0.151  0.664  1.191 
-anova(lm.happiness.bmistress) +
-plot(d.yyk)+
  
 +Coefficients:
 +            Estimate Std. Error t value Pr(>|t|)   
 +(Intercept)  6.39910    1.51654    4.22   0.0039 **
 +x2          -0.54473    0.22636   -2.41   0.0470 * 
 +x1           0.01184    0.00356    3.33   0.0127 * 
 +---
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
  
-lm.happiness.bmi <- lm(happiness ~ bmi, data=d.yyk) +Residual standard error: 0.93 on 7 degrees of freedom 
-summary(lm.happiness.bmi) +Multiple R-squared:  0.798, Adjusted R-squared:  0.74  
-anova(lm.happiness.bmi)+F-statistic: 13.8 on 2 and 7 DF,  p-value: 0.0037
  
-lm.happiness.stress <- lm(happiness ~ stress, data = d.yyk) +> anova(lm(y~x2+x1, data=df)) 
-summary(lm.happiness.stress) +Analysis of Variance Table
-anova(lm.happiness.stress)+
  
-# 공통부분을 찾기  +Response: y 
-# methd. 1 +          Df Sum Sq Mean Sq F value Pr(>F)    
-ab <- summary(lm.happiness.bmi)$r.square +x2         1  14.38   14.38    16.6 0.0047 ** 
-bc <- summary(lm.happiness.stress)$r.square +x1         1   9.57    9.57    11.1 0.0127 *  
-abc <- summary(lm.happiness.bmistress)$r.square +Residuals  7   6.06    0.87                   
-b <- ab+bc-abc +--- 
-b +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
-# spcor +>  
-# spcor method +> # note on 2 t-tests in summary 
-spcor.test(happiness,bmi,stress) +> # anova에서의 x1, x2에 대한 테스트와  
-a <- spcor.test(happiness,bmi,stress)$estimate^2 +> # lm에서의 x1, x2에 대한 테스트 (t-test) 간에 
-spcor.test(happiness,stress,bmi) +> # 차이가 있음에 주의 (x1, x2에 대한 Pr 값이  
-c <- spcor.test(happiness,stress,bmi)$estimate^2 +> # 다름). 그 이유는  
-abc <- summary(lm.happiness.bmistress)$r.square +> # t-tests는 __pr__ 테스트로 테스트를  
-abc-a-c+> # (spr, zero_order_r 테스트가 아님) 하고 
 +> # anova test는 x1 전체에 대한 테스트 하고 
 +> # x2는 x1에 대한 테스트 외에 나머지를 가지고 
 +> # 테스트하기 때문에 그러함 
 +>  
 +> # 또한 anova test에서 두번째 IV의 F값은  
 +> # summary(lm)에서 두번 째 IV의 t값의 제곱값 
 +> # 임을 이해. 이는 두번 째 IV의 설명력을 나 
 +> # 타내는 부분이 lm과 anova 모두 같기 때문 
 +> # 반면에 첫번째 IV의 경우에는 lm 분석 때에는 
 +> # 고유의 설명력만을 가지고 (semi-partial cor^2) 
 +> # 판단을 하는 반면에, anova는 x2와 공유하는  
 +> # 설명력도 포함해서 분석하기 때문에 t값의 
 +> # 제곱이 F값이 되지 못함 
 +>  
 +> # beta에 대한 설명 
 +> # beta coefficient (standardized b) 
 +> # beta <- b * (sd(x)/sd(y)) 
 +> beta1 <- b1 * (sd(df$x1)/sd(df$y)) 
 +> beta2 <- b2 * (sd(df$x2)/sd(df$y)) 
 +> beta1 
 +    x1  
 +0.6161  
 +> beta2 
 +     x2  
 +-0.4459  
 +>  
 +> # install.packages("lm.beta") 
 +> library(lm.beta) 
 +> lm.beta(lm.y.x1x2)
  
-# tidious one +Call: 
-# omitt+lm(formula = y ~ x1 + x2, data = df)
  
-# bmi --> stress --> happiness +Standardized Coefficients:: 
-summary(lm.happiness.bmi) +(Intercept)          x1          x2  
-summary(lm.happiness.stress) +         NA      0.6161     -0.4459 
-summary(lm.happiness.bmistress)+
  
-lm.bmi.stress <- lm(bmi~stress, data = d.yyk) +>  
-res.lm.bmi.stress <- lm.bmi.stress$residuals +> ####################################################### 
-lm.happiness.res.lm.bmi.stress <- lm(happiness~res.lm.bmi.stress) +> # partial correlation coefficient and pr2 
-summary(lm.happiness.res.lm.bmi.stress)+> # x2's explanation?  
 +> # understand with diagrams first 
 +> # then calculate with r 
 +> lm.tmp.1 <- lm(x2~x1, data=df) 
 +> res.x2.x1 <- lm.tmp.1$residuals 
 +>  
 +> lm.tmp.2 <- lm(y~x1, data=df) 
 +> res.y.x1 <- lm.tmp.2$residuals 
 +>  
 +> lm.tmp.3 <- lm(res.y.x1 ~ res.x2.x1, data=df) 
 +> summary(lm.tmp.3)
  
-lm.stress.bmi <- lm(stress~bmi, data = d.yyk) +Call: 
-reg.lm.stress.bmi <- lm.stress.bmi$fitted.values - mean(stress) +lm(formula = res.y.x1 ~ res.x2.x1, data = df)
-lm.happiness.reg.lm.stress.bmi <- lm(happiness~reg.lm.stress.bmi) +
-summary(lm.happiness.reg.lm.stress.bmi) +
-summary(lm.happiness.stress)+
  
-a <- summary(lm.happiness.res.lm.bmi.stress)$r.square +Residuals: 
-b <- summary(lm.happiness.reg.lm.stress.bmi)$r.square +   Min     1Q Median     3Q    Max  
-c <- summary(lm.happiness.stress)$r.square +-1.217 -0.578 -0.151  0.664  1.191 
-a +
-b +
-c +
-a+b+
  
-lm.stress.bmi <- lm(stress~bmi, data = d.yyk) +Coefficients: 
-lm.bmi.stress <- lm(bmi~stress, data = d.yyk) +             Estimate Std. Error t value Pr(>|t|)   
-summary(lm.stress.bmi) +(Intercept)  6.28e-18   2.75e-01    0.00    1.000   
-# stress.hat = a + b * bmi +res.x2.x1   -5.45e-01   2.12e-01   -2.57    0.033 * 
-stress.hat <- -1.40167 + (0.16787 * bmi) +--- 
-stress.hat +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
-reg.stress+
  
-summary(lm.bmi.stress) +Residual standard error: 0.87 on 8 degrees of freedom 
-reg.bmi+Multiple R-squared:  0.453, Adjusted R-squared:  0.384  
 +F-statistic: 6.62 on 1 and 8 DF,  p-value: 0.033
  
 +> summary(lm.tmp.3)$r.squared
 +[1] 0.4527
 +> sqrt(summary(lm.tmp.3)$r.squared)
 +[1] 0.6729
 +> # install.packages("ppcor")
 +> library(ppcor)
 +> partial.r <- pcor.test(df$y, df$x2, df$x1)
 +> str(partial.r)
 +'data.frame': 1 obs. of  6 variables:
 + $ estimate : num -0.673
 + $ p.value  : num 0.047
 + $ statistic: num -2.41
 + $ n        : int 10
 + $ gp       : num 1
 + $ Method   : chr "pearson"
 +> partial.r$estimate
 +[1] -0.6729
 +> summary(lm.tmp.3)
  
 +Call:
 +lm(formula = res.y.x1 ~ res.x2.x1, data = df)
  
-reg.stress <- lm.stress.bmi$fitted.values +Residuals: 
-reg.bmi <- lm.bmi.stress$fitted.values+   Min     1Q Median     3Q    Max  
 +-1.217 -0.578 -0.151  0.664  1.191 
  
-reg.stress +Coefficients: 
-reg.bmi +             Estimate Std. Error t value Pr(>|t|)   
-d.yyk+(Intercept)  6.28e-18   2.75e-01    0.00    1.000   
 +res.x2.x1   -5.45e-01   2.12e-01   -2.57    0.033 * 
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
  
-lm.tmp <- lm(reg.stress~reg.bmi) +Residual standard error: 0.87 on 8 degrees of freedom 
-lm.tmp2 <- lm(reg.bmi~reg.stress) +Multiple R-squared:  0.453, Adjusted R-squared:  0.384  
-summary(lm.tmp) +F-statistic: 6.62 on 1 and 8 DF,  p-value: 0.033
-summary(lm.tmp2)+
  
-sqrt(summary(lm.tmp)$r.square) +> summary(lm.tmp.3)$r.square 
-summary(lm.stress.bmi) +[1] 0.4527 
-summary(lm.bmi.stress)+> partial.r$estimate^2 
 +[1] 0.4527 
 +>  
 +>  
 +> # x1's own explanation? 
 +> lm.tmp.4 <- lm(x1~x2, data=df) 
 +> res.x1.x2 <- lm.tmp.4$residuals 
 +>  
 +> lm.tmp.5 <- lm(y~x2, data=df) 
 +> res.y.x2 <- lm.tmp.5$residuals 
 +>  
 +> lm.tmp.6 <- lm(res.y.x2 ~ res.x1.x2, data=df) 
 +> summary(lm.tmp.6)
  
-summary(lm(happiness~stress, data = d.yyk)) +Call: 
-summary(lm(happiness~reg.bmi, data = d.yyk))+lm(formula = res.y.x2 ~ res.x1.x2, data = df)
  
-summary(lm(happiness~bmi, data=d.yyk)) +Residuals: 
-summary(lm(happiness~reg.stress, data=d.yyk))+   Min     1Q Median     3Q    Max  
 +-1.217 -0.578 -0.151  0.664  1.191 
  
-plot(tmp.a, tmp.b) +Coefficients: 
-plot(tmp.b, tmp.a)+            Estimate Std. Error t value Pr(>|t|)    
 +(Intercept) 1.33e-17   2.75e-01    0.00   1.0000    
 +res.x1.x2   1.18e-02   3.33e-03    3.55   0.0075 ** 
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
  
-head(d.yyk) +Residual standard error: 0.87 on 8 degrees of freedom 
-str(d.yyk) +Multiple R-squared:  0.612, Adjusted R-squared:  0.564  
-d.yyk +F-statistic: 12.6 on 1 and 8 DF,  p-value: 0.00746 
-#########################+ 
 +>  
 +> partial.r <- pcor.test(df$y, df$x1, df$x2) 
 +> str(partial.r) 
 +'data.frame': 1 obs. of  6 variables: 
 + $ estimate : num 0.783 
 + $ p.value  : num 0.0127 
 + $ statistic: num 3.33 
 + $ n        : int 10 
 + $ gp       : num 1 
 + $ Method   : chr "pearson" 
 +> partial.r$estimate # this is partial correlation, not pr^2 
 +[1] 0.7825 
 +> # in order to get pr2, you should ^2 
 +> partial.r$estimate^2 
 +[1] 0.6123 
 +> summary(lm.tmp.6)$r.squared 
 +[1] 0.6123 
 +>  
 +> ####################################################### 
 +> # semipartial correlation coefficient and spr2 
 +> # 
 +> spr.y.x2.x1 <- spcor.test(df$y,df$x2,df$x1) 
 +> spr.y.x1.x2 <- spcor.test(df$y,df$x1,df$x2) 
 +> spr.y.x2.x1 
 +  estimate p.value statistic  n gp  Method 
 +1  -0.4087  0.2748    -1.185 10  1 pearson 
 +> spr.y.x1.x2 
 +  estimate p.value statistic  n gp  Method 
 +1   0.5647  0.1132      1.81 10  1 pearson 
 +> spr2.y.x2.x1 <- spr.y.x2.x1$estimate^2 
 +> spr2.y.x1.x2 <- spr.y.x1.x2$estimate^2 
 +> spr2.y.x2.x1  
 +[1] 0.167 
 +> spr2.y.x1.x2  
 +[1] 0.3189 
 +>  
 +> lm.tmp.7 <- lm(y ~ res.x2.x1, data=df) 
 +> summary(lm.tmp.7) 
 + 
 +Call: 
 +lm(formula = y ~ res.x2.x1, data = df) 
 + 
 +Residuals: 
 +   Min     1Q Median     3Q    Max  
 +-1.862 -1.171 -0.494  0.549  3.077  
 + 
 +Coefficients: 
 +            Estimate Std. Error t value Pr(>|t|)     
 +(Intercept)    8.000      0.559   14.31  5.5e-07 *** 
 +res.x2.x1     -0.545      0.430   -1.27     0.24     
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 + 
 +Residual standard error: 1.77 on 8 degrees of freedom 
 +Multiple R-squared:  0.167, Adjusted R-squared:  0.0629  
 +F-statistic:  1.6 on 1 and 8 DF,  p-value: 0.241 
 + 
 +> spr2.y.x2.x1  
 +[1] 0.167 
 +>  
 +> lm.tmp.8 <- lm(y~res.x1.x2, data=df) 
 +> summary(lm.tmp.8) 
 + 
 +Call: 
 +lm(formula = y ~ res.x1.x2, data = df) 
 + 
 +Residuals: 
 +   Min     1Q Median     3Q    Max  
 +-2.664 -0.608 -0.149  1.219  2.290  
 + 
 +Coefficients: 
 +            Estimate Std. Error t value Pr(>|t|)     
 +(Intercept)  8.00000    0.50540   15.83  2.5e-07 *** 
 +res.x1.x2    0.01184    0.00612    1.94    0.089 .   
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 + 
 +Residual standard error: 1.6 on 8 degrees of freedom 
 +Multiple R-squared:  0.319, Adjusted R-squared:  0.234  
 +F-statistic: 3.74 on 1 and 8 DF,  p-value: 0.089 
 + 
 +> spr2.y.x1.x2  
 +[1] 0.3189 
 +>  
 +> bcd # remember bcd in the above? 
 +[1] 0.7981 
 +> bd <- spr2.y.x2.x1 + spr2.y.x1.x2  
 +> bd 
 +[1] 0.4859 
 +> bcd - bd 
 +[1] 0.3123 
 +>  
 +> ####################################################### 
 +> # get the common area that explain the y variable 
 +> # 1. 
 +> summary(lm.y.x2) 
 + 
 +Call: 
 +lm(formula = y ~ x2, data = df) 
 + 
 +Residuals: 
 +   Min     1Q Median     3Q    Max  
 +-1.254 -0.888 -0.485  0.496  2.592  
 + 
 +Coefficients: 
 +            Estimate Std. Error t value Pr(>|t|)     
 +(Intercept)   10.791      1.119    9.64  1.1e-05 *** 
 +x2            -0.846      0.312   -2.71    0.027 *   
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 + 
 +Residual standard error: 1.4 on 8 degrees of freedom 
 +Multiple R-squared:  0.479, Adjusted R-squared:  0.414  
 +F-statistic: 7.36 on 1 and 8 DF,  p-value: 0.0265 
 + 
 +> all.x2 <- summary(lm.y.x2)$r.squared 
 +> all.x2 
 +[1] 0.4793 
 +> spr2.y.x2.x1 
 +[1] 0.167 
 +> cma.1 <- all.x2 - spr2.y.x2.x1 
 +> cma.1 
 +[1] 0.3123 
 +>  
 +> # 2. 
 +> summary(lm.y.x1) 
 + 
 +Call: 
 +lm(formula = y ~ x1, data = df) 
 + 
 +Residuals: 
 +   Min     1Q Median     3Q    Max  
 +-1.519 -0.897 -0.130  1.006  1.580  
 + 
 +Coefficients: 
 +            Estimate Std. Error t value Pr(>|t|)    
 +(Intercept)  3.61778    1.24152    2.91    0.019 *  
 +x1           0.01527    0.00413    3.70    0.006 ** 
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 + 
 +Residual standard error: 1.18 on 8 degrees of freedom 
 +Multiple R-squared:  0.631, Adjusted R-squared:  0.585  
 +F-statistic: 13.7 on 1 and 8 DF,  p-value: 0.00605 
 + 
 +> all.x1 <- summary(lm.y.x1)$r.squared 
 +> all.x1 
 +[1] 0.6311 
 +> spr2.y.x1.x2 
 +[1] 0.3189 
 +> cma.2 <- all.x1 - spr2.y.x1.x2 
 +> cma.2 
 +[1] 0.3123 
 +>  
 +> # OR 3. 
 +> summary(lm.y.x1x2) 
 + 
 +Call: 
 +lm(formula = y ~ x1 + x2, data = df) 
 + 
 +Residuals: 
 +   Min     1Q Median     3Q    Max  
 +-1.217 -0.578 -0.151  0.664  1.191  
 + 
 +Coefficients: 
 +            Estimate Std. Error t value Pr(>|t|)    
 +(Intercept)  6.39910    1.51654    4.22   0.0039 ** 
 +x1           0.01184    0.00356    3.33   0.0127 *  
 +x2          -0.54473    0.22636   -2.41   0.0470 *  
 +--- 
 +Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 
 + 
 +Residual standard error: 0.93 on 7 degrees of freedom 
 +Multiple R-squared:  0.798, Adjusted R-squared:  0.74  
 +F-statistic: 13.8 on 2 and 7 DF,  p-value: 0.0037 
 + 
 +> r2.y.x1x2 <- summary(lm.y.x1x2)$r.square 
 +> r2.y.x1x2 
 +[1] 0.7981 
 +> spr2.y.x1.x2 
 +[1] 0.3189 
 +> spr2.y.x2.x1 
 +[1] 0.167 
 +> cma.3 <- r2.y.x1x2 - (spr2.y.x1.x2 + spr2.y.x2.x1) 
 +> bcd - bd 
 +[1] 0.3123 
 +> cma.3 
 +[1] 0.3123 
 +>  
 +> cma.1  
 +[1] 0.3123 
 +> cma.2 
 +[1] 0.3123 
 +> cma.3 
 +[1] 0.3123 
 +>  
 +> # OR 애초에 simple regression과 multiple  
 +> # regression에서 얻은 R2을 가지고  
 +> # 공통설명력을 알아볼 수도 있었다. 
 +> r2.y.x1 <- summary(lm.y.x1)$r.square 
 +> r2.y.x2 <- summary(lm.y.x2)$r.square 
 +> r2.y.x1 
 +[1] 0.6311 
 +> r2.y.x2 
 +[1] 0.4793 
 +> r2.y.x1x2 <- summary(lm.y.x1x2)$r.square 
 +> r2.y.x1x2 
 +[1] 0.7981 
 +> cma.4 <- r2.y.x1 + r2.y.x2 - r2.y.x1x2 
 +> cma.4 
 +[1] 0.3123 
 +>  
 +> # Note that sorting out unique and common 
 +> # explanation area is only possible with  
 +> # semi-partial correlation determinant 
 +> # NOT partial correlation determinant 
 +> # because only semi-partial correlation 
 +> # shares the same denominator (as total  
 +> # y). 
 +> ############################################# 
 +>  
 +> 
 </code> </code>
-====== output ======+ 
 +====== explanation. added ====== 
 +{{:c:ms:2025:schedule:pasted:20250609-074413.png?400}}
 <code> <code>
 +# ex.
 +# resid(lm(y~x1, data=df)) = bc / delta.y
 +# resid(lm(y~x2, data=df)) = cd / delta.y
 +# resid(lm(y~x1+x2, data=df)) = bcd / delta.y
 +# b / delta.y = ?
 +# ce / delta.x2 = ?
 </code> </code>
  
 +<code>
 +# exp.added
 +spcor.test(df$y, df$x1, df$x2)
 +spcor.test(df$y, df$x1, df$x2)$estimate
 +spcor.test(df$y, df$x1, df$x2)$estimate^2
 +spcor.test(df$y, df$x2, df$x1)$estimate^2
 +summary(lm(y~x1+x2, data=df))$r.square
 +
 +b <- spcor.test(df$y, df$x1, df$x2)$estimate^2
 +d <- spcor.test(df$y, df$x2, df$x1)$estimate^2
 +bcd <- summary(lm(y~x1+x2, data=df))$r.square
 +
 +summary(lm(df$y~df$x1+df$x2, data=df))$r.square - 
 +  (spcor.test(df$y, df$x1, df$x2)$estimate^2 + 
 +     spcor.test(df$y, df$x2, df$x1)$estimate^2)
 +bcd - (b + d)
 +
 +</code>
  
 +====== Another one ======
 +[[:partial and semipartial correlation]]
  
c/ms/2025/schedule/w13.lecture.note.1748822885.txt.gz · Last modified: by hkimscil
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