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 George E. Higgins posted on Thursday, June 01, 2006 - 9:33 am
In the presentation of ex5.21 for Mplus 4.1, was "h" meant to be heretability? Thanks
 Linda K. Muthen posted on Thursday, June 01, 2006 - 9:53 am
Yes, it is.
 George E. Higgins posted on Thursday, June 15, 2006 - 3:15 pm
I'm trying to estimate a twin model that has two groups, but I need to estimate the effect of a covariate on y1 and y2. Specifically, I'm trying to estimate example 5.18 in the new user's manual. I'm trying to augment this model so that it is a MACE model. When I just add the covariate on y1 and y2, I can't seem to identify the model. That is, the model will not converge with a chi-square. Any thoughts as to why and how I can identify my model?
 Bengt O. Muthen posted on Thursday, June 15, 2006 - 3:27 pm
To understand this, you would have to send the output and license number to support@statmodel.com.
 craig neumann posted on Saturday, October 10, 2009 - 9:10 am
For CFA (perhaps also multiple group CFA), and when using a sample of twins, both MZs and DZs, is it possible to use the stratification option along with type = complex to handle nonindependence of twins in sample?
 Linda K. Muthen posted on Saturday, October 10, 2009 - 10:01 am
The CLUSTER option deals with non-independence of observations not STRATIFICATION. Non-independence of twins is already handled in ACE twin models because the two twins are analyzed together in a multivariate model that models the non-independence.
 craig neumann posted on Saturday, October 10, 2009 - 10:32 am
Thanks Linda. I haven't considered the ACE approach because I've not seen examples with twin data using latent variables, especially more than two LVs. In my case I am also doing longitudinal CFA and SEM.
 craig neumann posted on Sunday, October 11, 2009 - 9:49 am
what would be really helpful is if there was an example of a latent variable cross-lag panel model (2 LVs across 6 year period, LV1 & LV2 at T1 predict LV1 & LV2 at T2) using only male MZs, and Dzs.
 Linda K. Muthen posted on Sunday, October 11, 2009 - 10:34 am
You might find something helpful at:

http://www.statmodel.com/geneticstopic.shtml
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