Anonymous posted on Thursday, April 15, 2004 - 11:35 am
Is it in any way possible to run a stepwise regression on the between-level of a two-level model in mPlus? For example, I have six observed independent variables (I will specify measurement error in each of these), and one latent dependent variable. I would first like to see to what extent five of the independent variables explain variance in the dependent variable, and then add a sixth independent variable to see if it adds anything to the prediction. I read a paper by deJong (1999) about Cholesky factoring and phantom factors. Is it possible to use this procedure in mPlus? I would appreciate any suggestions.
bmuthen posted on Thursday, April 15, 2004 - 11:42 am
Mplus does not provide stepwise regression. You can do Cholesky factoring with phantom factors in a latent variable framework such as Mplus.
Anonymous posted on Friday, July 16, 2004 - 2:12 am
I have tried to run a Cholesky factoring with phantom factors (as described in deJong, 1999) without success. Could you please see whether there is anything wrong in the syntax I have specified below? I get an error message that there are insufficient data in the data file, but the file functions well doing regular regression. Another question: Bentler & Satorra has an alternative approach, where one use residuals as predictors in equations. Is this possible in mPlus? I am very grateful for all your help.
TITLE: CHOLESKY DATA: FILE IS cholesky.DAT; TYPE IS CORRELATION STDEVIATIONS; NOBSERVATIONS ARE 95; VARIABLE: NAMES ARE v1-v12 PH1 PH2 PH3 PH4; MODEL: AW BY V1-V3; SYN BY V4-V6; SRN BY V7-V8; NI BY V9-V11; WORDREC BY V12@1; V12@0; PH1@1; PH2@1; PH3@1; PH4@1; PH1 ON NI AW SYN SRN; PH2 ON AW SYN SRN; PH3 ON SYN SRN; PH4 ON SRN; AW@0; SYN@0; SRN@0; NI@0; PH1 WITH PH2@0PH3@0PH4@0; PH2 WITH PH3@0PH4@0; PH3 WITH PH4@0; WORDREC ON PH1 PH2 PH3 PH4; OUTPUT: STAND;
Anonymous posted on Friday, July 16, 2004 - 3:13 am
I just noticed an error in the VARIABLES part of the syntax I sent you, it should be:
VARIABLE: NAMES ARE v1-v12; USEVARIABLES v1-v12 ph1 ph2 ph3 ph4;
However, it still is not accepted, and the problem seem to be to get the program to accept phantom factors without indicators. Thanks for any suggestions about this.