Behavioral Genetics Models

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No user picture. valentinav Joined: 06/15/2020

ACE, ADE or ACDE model

Hi All,
I saw papers in which they estimated ADE instead of ACE because the correlation between MZs was twice as big as the one for DZs.
So far in my analysis I used the ACE model, and I was wondering whether I should try the ACE one.
I also read of some analysis estimating ACDE model, is there any example twin I could look at?
Is the ACDE analysis impossible when twins are raised together?

Thank you very much for your help

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No user picture. Leo Joined: 01/09/2020
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No user picture. JuanJMV Joined: 07/20/2016

Correlate residuals in common pathway model

Dear all,

I have fitted a common pathway model—one latent factor and 7 observed variables.

I have fitted a single-factor common pathway model since the previous literature has suggested this structure and also my confirmatory factor analysis.

As previous publications did in the confirmatory factor analysis, the model improved by correlating the residuals between two subscales since these two components have strong component overlap (one sub-scale is used to calculate the other). My confirmatory factor analysis also improved by doing so.

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No user picture. Benny Joined: 05/15/2020

Cholesky with latent traits

Hello, I want to estimate a modified CP model, where I have a Cholesky model with three latent traits (see picture attached).
The d- and e-variables are ordinal (d = 2 categories; e = 3 categories). The s-variable is continuous and in order to integrate it into the LISREL-matrices I define a single factor measurement model with the residual variance set to 0 and the factor loading to 1.
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No user picture. kumarsonu928292 Joined: 10/22/2020

What Things Should I Carry When Migrating from India to Australia?

hello, helpies.. i am migrating to Australia and want to know some important things. "What Things Should I Carry When Migrating to Australia" anyone with the same experience or any people from Australia who knows better. TIA..
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No user picture. Hilton28 Joined: 07/16/2020

Univariate ACE model for a binary variable

Hello,

Does anyone have an OpenMx script for running a Univariate ACE model for a binary variable? I would like to determine the proportion of variance accounted for by additive genetic, shared, and unique environment for a binary variable that indicates whether someone is or is not a member of a certain class of psychopathology.

Thank you in advance!
Emily

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No user picture. benruk Joined: 12/09/2019

RAM Cholesky Decomposition

Hello,

I am playing around with different kinds of twin models which I try to implement using the RAM-matrix approach, but not defining the expectation object with mxExpectationRAM(), but with mxExpectationNormal(). My idea is to create the A, S (one for MZs and one for DZs) and F matrices as well as the Identity matrix with the mxMatrix() functions and then creating the expected covariance matrices for MZs and DZs with the mxAlgebra() function following the RAM matrix formula.