I can see several twin data sets that come with OpenMx, for example, the DZO data described by following page:
https://openmx.ssri.psu.edu/docs/OpenMx/latest/_static/Rdoc/dzoData.html
Would anyone please provide more background about this data? The sample size seems to indicate that it is not simulated data, but no descriptions are given for the variables.
I would appreciate it. Thanks.
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The BMI dataset is documented and referenced.
?twinData
Not sure about the others...
Martin, N. G. & Jardine, R. (1986). Eysenck's contribution to behavior genetics. In S. Modgil & C. Modgil (Eds.), Hans Eysenck: Consensus and Controversy. Falmer Press: Lewes, Sussex.
Martin, N. G., Eaves, L. J., Heath, A. C., Jardine, R., Feindgold, L. M., & Eysenck, H. J. (1986). Transmission of social attitudes. Proceedings of the National Academy of Science, 83, 4364-4368.
I just did some search and can see "ETC88.R" in the description of this data set refers to an R code written by Hermine, but no background of the data is given there except that they are used to estimate Extended Twin-kinship Correlations. Anyone here knows more about the background?
Thanks for pointing to the BMI data set.