PCA {KernSmoothIRT}

ksIRT - kernel smoothing in Item Response Theory

Description

Returns a vector with each subjects expected test score.

Usage

PCA(x,...)

Arguments

x

a ksIRT object to be analyzed.

...

other arguments to pass to the prcomp function from the stats package.

References

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.