Peter,
I am not sure if anyone answered your question about doing biplots using
polychoric output and PCA.
The biplot.psych example # 3 shows how to do this
library(psych)
> responses <- table2df(bock.table[,2:6],count=bock.table[,7],
> labs= paste ("lsat6.",1:5,sep="”))
> W <-
I have data set with binary responses. I would like to
conduct polychoric principal component analysis (pPCA). I know there are
several packages used in PCA but I could not find one that directly estimate
pPCA and graph the individuals and variables maps. I will appreciate any help
that expand t
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