Authors: Bernaards, CA Sijtsma, K

Citation: Ca. Bernaards et K. Sijtsma, Influence of imputation and EM methods on factor analysis when item nonresponse in questionnaire data is nonignorable, MULTIV BE R, 35(3), 2000, pp. 321-364

Authors: Bernaards, CA Sijtsma, K

Citation: Ca. Bernaards et K. Sijtsma, Factor analysis of multidimensional polytomous item response data suffering from ignorable item nonresponse, MULTIV BE R, 34(3), 1999, pp. 277-313