Quadratic growth model with ZIP varia... PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
Message/Author
 andrea j wong posted on Wednesday, August 04, 2010 - 7:03 pm
I want to contruct a quadratic growth model with ZIP variables. Have I got the model specified correctly? If so, do you have any suggestions for how I can avoid the fatal error of insufficient memory?

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TITLE:
SAFETALK transmission risk perception longitudinal analysis - no mediation
quadratic growth model with zero inflated poisson vars, with uavi < 130

DATA:
FILE IS safetalk063010LongMed.dat;

VARIABLE:
NAMES ARE
arm numUAVI1 numUAVI2 numUAVI3 numUAVI4;
USEVARIABLES ARE
arm numUAVI1 numUAVI2 numUAVI3 numUAVI4;
USEOBSERVATIONS ARE
(numUAVI1 < 130) and
(numUAVI2 < 130) and
(numUAVI3 < 130) and
(numUAVI4 < 130);
COUNT ARE
numUAVI1-numUAVI4 (i);
MISSING ARE
ALL (999);

MODEL:
[numUAVI1 numUAVI2 numUAVI3 numUAVI4] (1);

intY slpY quadY | numUAVI1@0 numUAVI2@1 numUAVI3@2 numUAVI4@3;
intYi slpYi quadYi | numUAVI1#1@0 numUAVI2#1@1 numUAVI3#1@2 numUAVI4#1@3;

intY slpY quadY intYi slpYi quadYi on arm;

intY with slpY* quadY*;
slpY with quadY*;
intYi with slpYi* quadYi*;
slpYi with quadYi*;

OUTPUT:
TECH1 TECH8;
 Linda K. Muthen posted on Thursday, August 05, 2010 - 4:27 pm
I would suggest using INTEGRATION = 7; in the ANALYSIS command and asking for SVALUES in the OUTPUT command. Once you have the starting values, you can rerun with the default INTEGRATION = 15; to check for stability.
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