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 Ray F posted on Friday, April 05, 2013 - 3:02 pm
Hi,

I wrote out A two-level SEM program (factors:t1sc, t2sc and t1lsc; t1sc and t2sc are level-1 factors and t1lsc is a level-2 factor)
as follows:
VARIABLE: MISSING ARE ALL (-999);
NAMES = id sex groupid class pa1 psn1 tsc1 forl1
pa2 psn2 tsc2 forl2 lpa1 lpsn1 ltsc1 lforl1 ;
USEVARIABLES = groupid pa1 psn1 tsc1 forl1
pa2 psn2 tsc2 forl2 lpa1 lpsn1 ltsc1 lforl1 ;
WITHIN = pa1 psn1 tsc1 forl1;
BETWEEN = lpa1 lpsn1 ltsc1 lforl1;
CLUSTER = groupid;
ANALYSIS:
TYPE = TWOLEVEL RANDOM; ESTIMATOR = MLR;
MODEL:
t1lsc BY lpa1 lpsn1 ltsc1 lforl1;
%WITHIN%
t1sc BY pa1 psn1 tsc1 forl1;
t2sc BY pa2 psn2 tsc2 forl2;
t2sc ON t1sc;
edslope | t2sc ON t1sc;
%BETWEEN%
t2sc ON t1lsc;
edslope ON t1lsc;
t1lsc WITH t1sc;
But I got a warning saying that "*** ERROR in MODEL command
The labels %BETWEEN% or %WITHIN% must be specified." I don't know how to fix it and also wonder if it is because I use wide form rather than long form data. I don't think I need to reshape the dataset into a long set because I only have two time occasions here. Indeed, variables at time1 are indepent while same variables measured at time2 are dependent.
 Linda K. Muthen posted on Friday, April 05, 2013 - 3:28 pm
The following statement should not come before %WITHIN%

t1lsc BY lpa1 lpsn1 ltsc1 lforl1;

You can have the data in wide format.
 Ray F posted on Friday, April 05, 2013 - 4:42 pm
Thank you for your prompt response, Linda!
In this case, where should I put this statement in the program so as to represent the CFA part?
In addition, a general question, is long format specific to longitudinal data? I am confused here that although my data is longitudinal (measured at two occasions), it is actually not that time-repeated as most of the examples illustrated in the Mplus User's Guide.

Thank you!
 Linda K. Muthen posted on Friday, April 05, 2013 - 5:41 pm
See the examples in Chapter 9 of the user's guide. There are many examples that are not growth models. Long format is generally used for growth models.
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