I am running the script: MultivariateTwinAnalysis_MatrixRaw.R from the TC24 homepage, on my own data.
I don't seem to be able to create any saturated output from the following commands, although the multiTwinSatFit is not empty:
parameterSpecifications(multiTwinSatFit)
expectedMeansCovariances(multiTwinSatFit)
tableFitStatistics(multiTwinSatFit)
I get the following error messages:
Error: could not find function "parameterSpecifications"
Error: could not find function "expectedMeansCovariances"
Error: could not find function "tableFitStatistics"
I am just beginning to learn to run twin analyyses through OpenMx - very happy if anyone could tell me what I am doing wrong.
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I think you need to source the Genetic Epi Helper Functions: http://www.vipbg.vcu.edu/~vipbg/Tc24/GenEpiHelperFunctions.R. The link is at the bottom right of the TC24 homepage. But I admit there's no instructions that you need to include this file.
Thank you, that helped!
One more question concerning this script:
The parts of the script that concern fitting the multivariate saturated model, and fitting multivariate model with equal means & variances across twin order and zygosity, fail when running the script on my data.
In the first I get the following error message:
Running multiTwinSat
Error in FUN(X[[3L]], ...) :
Could not find function with name : and 2 arguments,
and in the second the error message is tha object "uniTwinSatFit" cannot be found.
I have edited the script by setting correct starting values. Are there any other adaptations that need to be made in order to run the script on my own data?
I think upgrading to the latest version of OpenMx will make the first error go away. The ":" operator for matrix selection was implemented in the past month.
Thanks once again for useful help! Ugrading OpenMx fixed the first problem. However, I discovered an error in the example script, in that it calls for a non-existing object uniTwinSatFit that needs to be changed to multiTwinSatFit.