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Returns a vector with each subjects expected test score.
PCA(x,...)
a ksIRT object to be analyzed.
ksIRT
other arguments to pass to the prcomp function from the stats package.
prcomp
stats
Ramsay, J.O. (2000). TestGraf: A program for the graphical analysis of multiple choice test and questionnaire data.
Silverman, B.W. (1986). Density Estimation for Statistics and Data Analysis. Chapman & Hall, London.