logistic_regression
Differences
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| logistic_regression [2024/12/10 05:46] – [coefficient (계수) 해석] hkimscil | logistic_regression [2024/12/11 02:57] (current) – [exercise: binary IV] hkimscil | ||
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| > df$gene <- factor(df$gene, | > df$gene <- factor(df$gene, | ||
| > df$cancer <- factor(df$cancer, | > df$cancer <- factor(df$cancer, | ||
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| - | 311 norm nocancer | + | |
| - | 312 norm nocancer | + | |
| - | 313 norm nocancer | + | |
| - | 314 norm nocancer | + | |
| - | 315 norm nocancer | + | |
| - | 316 norm nocancer | + | |
| - | 317 norm nocancer | + | |
| - | 318 norm nocancer | + | |
| - | 319 norm nocancer | + | |
| - | 320 norm nocancer | + | |
| - | 321 norm nocancer | + | |
| - | 322 norm nocancer | + | |
| - | 323 norm nocancer | + | |
| - | 324 norm nocancer | + | |
| - | 325 norm nocancer | + | |
| - | 326 norm nocancer | + | |
| - | 327 norm nocancer | + | |
| - | 328 | + | |
| - | 329 norm nocancer | + | |
| - | 330 norm nocancer | + | |
| - | 331 norm nocancer | + | |
| - | 332 norm nocancer | + | |
| - | 333 norm nocancer | + | |
| - | 334 norm nocancer | + | |
| - | 335 norm nocancer | + | |
| - | 336 norm nocancer | + | |
| - | 337 norm nocancer | + | |
| - | 338 norm nocancer | + | |
| - | 339 norm nocancer | + | |
| - | 340 norm nocancer | + | |
| - | 341 norm nocancer | + | |
| - | 342 norm nocancer | + | |
| - | 343 norm nocancer | + | |
| - | 344 norm nocancer | + | |
| - | 345 norm nocancer | + | |
| - | 346 norm nocancer | + | |
| - | 347 norm nocancer | + | |
| - | 348 norm nocancer | + | |
| - | 349 norm nocancer | + | |
| - | 350 norm nocancer | + | |
| - | 351 norm nocancer | + | |
| - | 352 norm nocancer | + | |
| - | 353 norm nocancer | + | |
| - | 354 norm nocancer | + | |
| - | 355 norm nocancer | + | |
| - | 356 norm nocancer | + | |
| > tab <- table(df) | > tab <- table(df) | ||
| > tab | > tab | ||
| Line 1104: | Line 406: | ||
| </ | </ | ||
| - | ====== Odds ratio in logistic | + | ===== Odds ratio in logistic ===== |
| \begin{align*} | \begin{align*} | ||
| ln(\frac{p}{1-p}) = & y \\ | ln(\frac{p}{1-p}) = & y \\ | ||
| Line 1144: | Line 446: | ||
| * 즉, $log(om/of) = b$ | * 즉, $log(om/of) = b$ | ||
| * $log(1.444613) = b$ | * $log(1.444613) = b$ | ||
| + | * $ 1.444613 = e^b$ | ||
| < | < | ||
| > log(1.444613) | > log(1.444613) | ||
| Line 1254: | Line 557: | ||
| </ | </ | ||
| 마리화나의 사용경험에서 남성이 여성보다 큰 승산이 있다고 판단되었다 (Odds ratio (OR) = 1.44; 95% CI = 1.13, 1.86; p = .004). 남성은 여성보다 약 44% 더 사용경험을 할 승산을 보였다 (OR = 1.44). | 마리화나의 사용경험에서 남성이 여성보다 큰 승산이 있다고 판단되었다 (Odds ratio (OR) = 1.44; 95% CI = 1.13, 1.86; p = .004). 남성은 여성보다 약 44% 더 사용경험을 할 승산을 보였다 (OR = 1.44). | ||
| + | ====== exercise: binary IV ====== | ||
| + | < | ||
| + | ######################################## | ||
| + | # exercise | ||
| + | |||
| + | head(df) | ||
| + | table(df) | ||
| + | # base 바꾸기 | ||
| + | df.norm <- df %>% mutate(gene = relevel(gene, | ||
| + | df.mut <- df %>% mutate(gene = relevel(gene, | ||
| + | |||
| + | |||
| + | logm.cancer.gene.1 <- glm(cancer ~ gene, family = binomial, data = df.norm) | ||
| + | summary(logm.cancer.gene.1) | ||
| + | a <- logm.cancer.gene.1$coefficients[1] | ||
| + | b <- logm.cancer.gene.1$coefficients[2] | ||
| + | a | ||
| + | b | ||
| + | a+b | ||
| + | # when b = 0; 즉, mutant = 0 일 때 | ||
| + | # log(odds.norm) = a 이므로 | ||
| + | # odds.norm = e^a | ||
| + | exp(a) | ||
| + | # 확인 | ||
| + | odds(p.can.norm) | ||
| + | # odds.mut = e^(a+b) | ||
| + | exp(a+b) | ||
| + | odds(p.can.mut) | ||
| + | # odds.ratio = e^(b) | ||
| + | exp(b) | ||
| + | odds.ratio(p.can.mut, | ||
| + | |||
| + | |||
| + | logm.cancer.gene.2 <- glm(cancer ~ gene, family = binomial, data = df.mut) | ||
| + | summary(logm.cancer.gene.2) | ||
| + | a <- logm.cancer.gene.2$coefficients[1] | ||
| + | b <- logm.cancer.gene.2$coefficients[2] | ||
| + | a | ||
| + | b | ||
| + | a+b | ||
| + | # when b = 0; 즉, mutant = 0 일 때 | ||
| + | # log(odds.norm) = a 이므로 | ||
| + | # odds.norm = e^a | ||
| + | exp(a) | ||
| + | # 확인 | ||
| + | odds(p.can.mut) | ||
| + | # odds.mut = e^(a+b) | ||
| + | exp(a+b) | ||
| + | odds(p.can.norm) | ||
| + | # odds.ratio = e^(b) | ||
| + | exp(b) | ||
| + | odds.ratio(p.can.norm, | ||
| + | |||
| + | |||
| + | </ | ||
| ====== X: numeric variable ====== | ====== X: numeric variable ====== | ||
| < | < | ||
logistic_regression.1733809596.txt.gz · Last modified: by hkimscil
