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...I conduct a logistic regression. I understand that the correction would be equivalent to the three parameter logistic model (3PL) in IRT but am unsure how to best fit it from a logistic regression in R. Thanks much, Mike Lau __________________________________ Michael Y. Lau, M.A. 118 Haggar Hall Department of Psychology University of Notre Dame Notre Dame, IN 46556 [[alternative HTML version deleted]]

...r, this is giving me .25 as the value for intercepts and all the regression weights. Am I correcting for the guessing base rate correctly? Any suggestions or pointers would be greatly appreciated. Thank you in advance. Mike Lau __________________________________ Michael Y. Lau, M.A. 118 Haggar Hall Department of Psychology University of Notre Dame Notre Dame, IN 46556 (574) 631-1904 mlau@nd.edu [[alternative HTML version deleted]]

...tion I have used (and that appears to be used by SAS) ensures that diag(x1 x1')=I, where x1 denotes the normalized loadings. Which set of loadings are the correct promax loadings? Christof Schuster Christof Schuster University of Notre Dame Department of Psychology 103 Haggar Hall Notre Dame, IN 46556 Tel: (574) 631-5473 email: cschuste at nd.edu Fax: (574) 631-8883 www.nd.edu/~cschuste

...# So, I guess, I am wondering does factanal calculate the # regression factor scores correctly? Maybe I am missing # something. Any comments will be highly appreciated. # Thanks, # Christof Schuster Christof Schuster University of Notre Dame Department of Psychology 103 Haggar Hall Notre Dame, IN 46556 Tel: (574) 631-5473 email: cschuste at nd.edu Fax: (574) 631-8883 www.nd.edu/~cschuste