Behavioral Genetics Models

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

ACE output: what is the p

Hi All,
I run the ACE model and got a summary table which reports the p among others.

The p is also not clear to me. Apparently it is higher for the winning model, but what exactly is this p?

Thanks,
Valentina

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No user picture. Leo Joined: 01/09/2020

ACE RAM model with ordinal manifest

Hi.

I've been trying everything to get an ordinal manifest working in RAM models but I can't get it done. Also, didn't find anything online about this, as most examples have matrix specification. Would be very appreciated to get some help. Besides from the solution below, I have also tried every possible way with mxthreshold and umxthresholdmatrix.

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

really similar AIC

Hi All,
I run the ACE model and submodels, and the AIC are really similar.
ACE 2579
AE 2577.5
CE 2577.3
E 2584

Overall, I always get a difference of 1 between the AIC.
The best winning model is always coherent with the results of the correlation analysis, so I tend to trust it, however, the difference is really little.
Is there a way to establish what is a significant difference between AIC?

Thank you all!
Valentina

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No user picture. lemire Joined: 12/13/2019

ACE: negative variance component from H.Maes’ published script and slides

Hi,
could you help provide some insights as to why running the following script, which uses data(twinData), gives negative estimates for Vc in an ACE model?

https://ibg.colorado.edu/cdrom2020/maes/twinModeling/oneACEvc.R

These are the most relevant lines related to the model:

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No user picture. inooradd Joined: 03/11/2020

Step 1: Testing basic assumptions (equal means & variances for twin 1/twin 2 and MZ/DZ pairs)

Hello!

I am following the steps laid out in [this](https://vipbg.vcu.edu/media/course/HGEN619_2015/TwinModels.pdf ) openmx presentation and could use help with step 1.

1. Use data to test basic assumptions (equal means & variances for twin 1/twin 2 and MZ/DZ pairs)

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

ACE model lower CI negative number

Hi All,
I am new to ACE model estimation so I am trying to follow some tutorials I found online (script attached).

The results seems fine, and are also coherent with another script I used. However, I got negative lower CI: ACEvc.VarC[1,4] -0.2443061 0.23255753 0.7557620.
Does this make sense to you? As far as I know when CI include 0 we cannot conclude that the value is different from 0...

I would really appreciate whether someone could help me with this.
Thank you in advance!
Best,
Valentina

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No user picture. inooradd Joined: 03/11/2020

Comparing ACE and ADE models

Hello,

I have a couple of questions regarding comparing ACE and ADE models.

1. Is there a quick method of comparing the fit of both of these models? As of right now I am running the scripts for each model, then comparing the two models using mxcompare:

<%
mxCompare( fitADENOTW , fitACENOTW ) %>

I know typically when we compare nested, we run something to the effect of...

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