Description:

This folder contains a sample SAS program and data set for twin analysis (to be made available upon publication of the manuscript).

Citation:

R. Feng, G. Zhou, M. Zhang and H.P. Zhang. Twin analysis using SAS.

To perform an analysis:

1. Prepare the data file as in the sample data set.
2. Open SAS, and replace the data file name and the variable names with yours.
3. Run the program.