PCA for categorical variables- Score??

[Asal Pilehvari]

Hi everyone,

I have three categorical variables and I would like to extract a component out of them by PCA. I know that I should use "Polychoric" for finding the correlation matrix and then using "pcamat" for executing PCA on my correlation matrix. However, "predict" command does not work for the "pcamat" (according to the postestimation pca document of Stata). Now, my question is that how can I extract the factors out of my eigenvalues? Is there any available command for that or should I code it myself?



Thanks,
Asal