Student 09 posted on Tuesday, December 30, 2008 - 6:19 am
I have a question regarding the intercepts of the observed indicators on the within-level in a twolevel factor analysis. Is it correct that the intercepts must be considered to equal zero - because on the within-level, the data are pooled and group mean centered?
Student 09 posted on Thursday, January 08, 2009 - 9:37 am
Hello, here is a follow-up question.
I wonder whether it is possible to examine if the intercepts (tauís) of the observed indicators of a within-level factor vary across between-level units?
I am struggling with this question, because if in twolevel factor analyses the vector of intercepts of the within-level factors is assumed to be zero - does this imply that one can't test for varying intercepts?
My question is motivated by the idea that varying indicator intercepts between contexts could be seen to indicate contextual-level differential item functioning. Would you agree with this view?