Hi, when examining longitudinal measurement invariance, comparing equal form, factor loading, and indicator intercept models, I understand that chi-sq diff testing is done to check as to whether the nested models differ compared to the comparison model; however, should I also be looking at estimates in the output to check for specific changes or non-changes in standardized or understandarized (not sure which) co-efficients?
Sean Tucker posted on Wednesday, August 26, 2009 - 8:46 pm
I have a three wave longitudinal dataset with equal time intervals. Following Chan (1998) I am trying to test for measurement invariance but I canít seem to find an applied example that shows the relevant MPlus syntax (including setting free vs. equal factor loadings, free vs. fixed error variances, etc) and guide to understanding the related output. Would you be so kind as to direct me to a simple applied example or provide the syntax in a reply? Iím relatively new to MPlus and I have a weak background in stats.
See the Topic 4 course handout starting with slide 77.
Sean Tucker posted on Thursday, August 27, 2009 - 11:14 am
Many thanks, Linda.
I received an error message (i.e., "*** ERROR in MODEL command Unknown variable(s) in a BY statement: (1)- ") when running the model with factor loading invariance:
V1 BY v11 v12 v13 v14 v15 v16 v17 (1)-(6); V2 BY v21 v22 v23 v24 v25 v26 v27 (1)-(6); V3 BY v31 v32 v33 v34 v35 v36 v37 (1)-(6);
Pages 532-533 of the user manual describe the syntax for fixing parameter values. Would you be so kind has to describe what (1) Ė (6) means in expanded form. Should I be using different command for fixing the parameter values?
Partial measurement invariance requires relaxing the equality constraints of some items which. Modification indices were used to determine which items. The Topic 1 course video covers testing for measurement invariance. You should listen to that and then the Topic 4 course video for a full explanation.