This function returns a vector with each subjects expected test score.
other arguments to pass to the
Ramsay, J.O. (2000). TestGraf: A program for the graphical analysis of multiple choice test and questionnaire data. http://www.psych.mcgill.ca/faculty/ramsay/ramsay.html.
Silverman, B.W. (1986). Density Estimation for Statistics and Data Analysis. Chapman & Hall, London.
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