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lat6
2013 Dec 17
1
Polychoric Principal Component Analysis (pPCA)
...ponent analysis pPCA using
#either of these packages
library(psych)
library(FactoMineR)
library(nsprcomp)
#Bock and Liberman (1970) data set of 1000 observations of the LSAT
#from psych
data(bock)
responses <- table2df(bock.table[,2:6],count=bock.table[,7],
??????????????? labs= paste ("lsat6.",1:5,sep=""))
fix(responses)
describe(responses)
#Estimate the polychoric correlation matrix to be used in
#PCA using psych
W <- polychoric(responses, smooth=TRUE,global=TRUE,polycor=F,
??????????? ML = FALSE,??std.err=FALSE,progress=TRUE)
#Regular PCA using stat, psych and...