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 Tongyun Li posted on Wednesday, September 25, 2013 - 9:20 pm
Hi,

I'm trying to run a multiple group logistic regression. I hope to compare the model without constraints and the model for which the regression coefficients are constrained to be equal across groups. The problem is that I have to use TYPE=COMPLEX with population weights and replicate weights to draw inference because the data is from a large-scale survey. It seems that DIFFTEST doesn't work with TYPE=COMPLEX. Is there another way to do model comparison test if I have to use TYPE=COMPLEX and plug in weights in my analysis?

Thank you very much!
 Linda K. Muthen posted on Wednesday, September 25, 2013 - 9:28 pm
It sounds like you are using WLSMV if you are using DIFFTEST. WLSMV give probit regression not logistic regression. You can use MLR and do difference testing and obtain logistic regression.
 Tongyun Li posted on Wednesday, September 25, 2013 - 9:28 pm
The estimator I used is WLSMV.
 Linda K. Muthen posted on Wednesday, September 25, 2013 - 9:35 pm
So use MLR instead.
 Tongyun Li posted on Wednesday, September 25, 2013 - 9:39 pm
Thank you, Dr.Muthen! As I also have missing data (which I coded as 99), which estimator is better in my situation?
 Linda K. Muthen posted on Wednesday, September 25, 2013 - 10:01 pm
MLR has better missing data handling.
 Tongyun Li posted on Wednesday, October 02, 2013 - 6:24 pm
Dr.Muthen,

I've tried MLR, but it doesn't work because it's not allowed with TYPE=COMPLEX and replicate weights, and my outcome variable is categorical. Does that mean WLSMV is the only choice for my analysis?

Thank you!
 Linda K. Muthen posted on Thursday, October 03, 2013 - 5:51 pm
WLSMV is your only option for categorical and replicate weights.
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