The default format for storing kinships uses four files: the binary file with extension grm.bin contains the pairwise kinships, while the text files with extensions grm.id, grm.details and grm.adjust contain, respectively, the sample IDs, details for each predictor and some fun facts about the kinship matrix.
Previously (until about 2014), the pairwise kinships were saved in a gzipped file. If you have a kinship matrix stored in this format, you can convert to the new format using the command --convert-gz <output> with the option --grm <kinfile>. LDAK will expect to find the files <kinfile>.grm.gz and <kinfile>.grm.id. If you wish to save to this format, then add --kinship-gz YES whenever running an LDAK command which produces a kinship matrix.
Alternatively, if the pairwise kinships are saved in a text file (as a square matrix with no headers), you can convert these to binary format using the command --convert-raw <output> with the option --grm <kinfile>. LDAK will search for the files <kinfile>.grm.raw and <kinfile>.grm.id. If you wish to save to this format, then add --kinship-raw YES whenever running an LDAK command which produces a kinship matrix.
