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Bootstrap in twins GxE model
Structural Equation Modeling
posted on Friday, September 07, 2007 - 1:11 pm
I use the "model contraint" command to model a GxE interaction in a AE model.
I request bootstrap S.E. and confidence interval with 1000 replication.
But all the S.E. are equal 0.
What is the problem ?
University of Montreal
Linda K. Muthen
posted on Tuesday, September 18, 2007 - 4:51 am
Please send your input, data, output, and license number to
. I don't see a reason offhand that this would happen.
posted on Monday, May 10, 2010 - 5:02 am
I am running a GxE model with two dichotomous moderators, one is a grouping variable (m vs d), like this:
new(ma mc me mt mu mv da dc de dt du dv);
varm1=(ma+mt*sexodef)**2 + (mc+mu*sexodef)**2 + (me+mv*sexodef)**2 ;
varm2=(ma+mt*sexjdef)**2 + (mc+mu*sexjdef)**2 + (me+mv*sexjdef)**2 ;
mzmc=(ma+mt*sexodef)*(ma+mt*sexjdef) + (mc+mu*sexodef)*(mc+mu*sexjdef);
dzmc=0.5*(ma+mt*sexodef)*(ma+mt*sexjdef) + (mc+mu*sexodef)*(mc+mu*sexjdef);
(this syntax repeats for the second group with 'd' instead of 'm').
This model runs well. However, it appears that it is not possible to compare the ACE components between the groups (so: ma=da, mc=dc, me=de). Am I doing something wrong?
Linda K. Muthen
posted on Monday, May 10, 2010 - 8:13 am
Please send the output and your license number to
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