

Latent Class Growth Anlaysis Quadrati... 

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Brian Don posted on Thursday, February 09, 2012  11:28 am



I am conducting a latent class growth analysis with four time points and three classes. I originally tested a quadratic term for all classes using the following syntax: CLASSES = c(3); Analysis: type = MIXTURE; STARTS = 100 10; STITERATIONS = 10; Model: %OVERALL% i s q RST1@0 RST2@3 RST3@6 RST4@11; iq@0; The quadratic term was only significant for one of the classes (e.g. class 1). Thus, I want to retain the quadratic term for Class 1 only and rerun the analysis. However, when I rerun the analysis after fixing the other two classes' quadratic term to zero, the classes seem to arbitrary switch so that Class 1 is no longer Class 1, and the quadratic term is fixed for the wrong two classes. Syntax for the second analysis: Model: %OVERALL% i s q RST1@0 RST2@3 RST3@6 RST4@11; iq@0; %c#1% [q]; %c#2% [q@0]; %c#3% [q@0]; Any help would be appreciated. Thanks! 


The classes can change order. If you don't want this, you need to use starting values and STARTS=0; 

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