LCGA and Changing the Reference Group PreviousNext
Mplus Discussion > Latent Variable Mixture Modeling >
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 Andrea Mata posted on Wednesday, September 15, 2010 - 11:55 am
Hello-

I am running a 3 class LCGA with covariates. But I want to change the reference group. I know to change the reference group you assign start values and have the wanted reference group to be the last class. I did this, but when my analyses are done running, the class I wanted to be the last/reference class is not the last class and another class that I assigned to be the second class is the last class. Any suggestions on how to address this problem?
 Linda K. Muthen posted on Wednesday, September 15, 2010 - 12:07 pm
It's hard to say without seeing your output. It may be that the classes are not that distinct. Please send the output and your license number to support@statmodel.com.
 Dallas posted on Tuesday, March 08, 2011 - 1:46 pm
I'm learning to specifying a growth mixture model in Mplus. I'd like to change the reference class from the last class to the first, but I'm not sure how to do this. Suppose I have the following code:

MODEL: %OVERALL%
AINT BY TALC1YR1-TALC1YR3@1;
ASLP BY TALC1YR1@0 TALC1YR2@1 TALC1YR3@2;
[TALC1YR1-TALC1YR3@0 ];
TALC1YR1 TALC1YR2 TALC1YR3;
AINT*.165 ASLP*.218;
AINT WITH ASLP*.2320;
%C#1%
[ AINT*5.647 ASLP*.250];
%C#2%
[AINT*4.000 ASLP*.003];
%C#3%
[AINT*4.390 ASLP*1.035];

What would I change to switch the reference class?

Thanks!
 Linda K. Muthen posted on Tuesday, March 08, 2011 - 2:00 pm
%C#3%
[ AINT*5.647 ASLP*.250];
%C#2%
[AINT*4.000 ASLP*.003];
%C#1%
[AINT*4.390 ASLP*1.035];
 ian jantz posted on Tuesday, August 23, 2011 - 9:36 pm
I am trying to change my reference category. My current code is:

MODEL:
%OVERALL%
i s | NSEXDR1@0 NSEXDR2@1 NSEXDR3@2 NSEXDR4@3 NSEXDR5@4 NSEXDR6@5 NSEXDR7@6 NSEXDR8@7 NSEXDR9@8 NSEXDR10@9 NSEXDR11@10 NSEXDR12@11 NSEXDR13@12 NSEXDR14@13 NSEXDR15@14 NSEXDR16@15;

%C#1%
[i*0.260 s*-0.044];
%C#2%
[i*-3.084 s*-0.071];
%C#3%
[i*-0.675 s*-0.016];

I am not entirely sure how to change this code so that the %C#1% becomes the reference category.
Thanks,
Ian
 Linda K. Muthen posted on Wednesday, August 24, 2011 - 7:06 pm
%C#3%
[i*0.260 s*-0.044];
%C#2%
[i*-3.084 s*-0.071];
%C#1%
[i*-0.675 s*-0.016];
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