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factor_analysis [2022/05/05 21:49] – [eigenvalues] hkimscilfactor_analysis [2023/11/06 02:53] (current) – [E.g. 2] hkimscil
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 | Y3  | $S_{31}$  | $S_{32}$  | $S^2_{3}$  | | Y3  | $S_{31}$  | $S_{32}$  | $S^2_{3}$  |
  
-실제 데이터에서 구한 variance covariance table은 아래와 같다. +실제 데이터에서 구한 variance covariance table은 아래와 같다((편의상 여기 분산값은 n으로 (n-1이 아닌) 나눠 준 것))
  
 | Variable  | Y1  | Y2  | Y3  | | Variable  | Y1  | Y2  | Y3  |
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 ## 예를 들어  ## 예를 들어 
 fd <- read.csv("http://commres.net/wiki/_media/r/fa_explanation.csv") fd <- read.csv("http://commres.net/wiki/_media/r/fa_explanation.csv")
 +fd <- fd[, -1] # 처음 id 컬럼 지우기
 cov(fd) cov(fd)
  
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 각주 1) -> finance = 수학능력 = F1 각주 1) -> finance = 수학능력 = F1
 각주 2), 3) -> marketing, policy = 언어능력 = F2 각주 2), 3) -> marketing, policy = 언어능력 = F2
-각주 4)는  아래와 같이 구함 = Eigenvalue라 부른다+각주 6)는  아래와 같이 구함 = Eigenvalue라 부른다
  
 <code> <code>
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 | Economics        @lightgreen:0.728  | | Economics        @lightgreen:0.728  |
 | Total            5.617  | | Total            5.617  |
 +===== Specificity =====
 +| Variable  |  Communality  |  Specificity  |
 +| Climate          0.795  |  @lightgray:1-0.795  |
 +| Housing          0.518  |     |
 +| Health          |  0.722  |     |
 +| Crime            0.512  |     |
 +| Transportation  |  0.51       |
 +| Education        0.561  |     |
 +| Arts            |  0.754  |     |
 +| Recreation      |  0.517  |     |
 +| Economics        0.728  |     |
 +| Total            5.617  |     |
  
 ====== Methods (functions) in R ====== ====== Methods (functions) in R ======
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 <code> <code>
-mydata <- read.csv("http://commres.net/wiki/_media/r/dataset_exploratoryfactoranalysis.csv")+my.data <- read.csv("http://commres.net/wiki/_media/r/dataset_exploratoryfactoranalysis.csv")
 # if data as NAs, it is better to omit them: # if data as NAs, it is better to omit them:
 my.data <- na.omit(my.data) my.data <- na.omit(my.data)
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 ====== Reference ====== ====== Reference ======
 {{:factor_analysis_lecture_note.pdf|Lecture Note}} from databaser {{:factor_analysis_lecture_note.pdf|Lecture Note}} from databaser
 +[[https://stats.oarc.ucla.edu/spss/seminars/introduction-to-factor-analysis/a-practical-introduction-to-factor-analysis/]] 
 +[[https://advstats.psychstat.org/book/factor/efa.php]] 
 +see exploratory factor analysis :: {{youtube>Ollp2nSQCLY}}
factor_analysis.1651754953.txt.gz · Last modified: 2022/05/05 21:49 by hkimscil

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