Hello,

I am dealing with GWAS data for survival analysis. After imputation by impute2, I got several files (*.impute2, *.impute2_info, *.impute2_info_by_sample, *.impute2_summary, *.impute2_warnings) for each chunk of each chromosome.

How can I convert these files to mach format in order to use GenABEL for survival analysis. I noticed 2 funtions impute2mach() or impute2databel() in GenABEL package. But failed to format the correct input files.

Could someone point me how to convert these files, or what data looks like for the input files of these functions?

Thank!