Programming the statistical procedures from SAS

Questions about PROC LTA

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Questions about PROC LTA

A Reddit poster has this question:

I am currently working on the second part of an analysis. In the first part I identified a latent variable of problem behaviour with 4 categories, at three timepoints. My goal is to conduct an LTA to look at the transitions between these categories over time. My syntax is as follows:

 

PROC LTA DATA=EXAMPLE OUTPOST=EXAMPLE_POST;
NSTATUS 4;
NTIMES 3;
ITEMS
     Problem_Behaviour_T1
     Problem_Behaviour_T2
     Problem_Behaviour_T3;
CATEGORIES 4;
MEASUREMENT TIMES;
SEED 100;
RUN;

 

My questions are as follows:

Is it okay to not include the indicator variables that went into indicating the latent variable: ProblemBehaviour? My indicators were continuous so I ran the latent class/latent profile analysis in MPlus.The analysis does seem to be working, but some weird stuff is happening when I look at the OUTPOST data. It appears that the categories of Problem_Behaviour are being presented in an incorrect order (i.e. 1=2, 2=1, 3=4, and 4=3). Any ideas why this might be happening?

 

I know that PROC LTA is not built by SAS -- it's a download from here.  But some of you might know enough about it to answer the question or lend some advice.  I'll be happy to summarize any responses back on Reddit.

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