The prefix of the columns for the matrix will be the choice of relationship metric:
IBD
(Identity by Descent),

IBS
(Identity by State), or

AS
(Allele Sharing). The output data will consist of the input data set with the columns of the square rooted matrix appended and will have the suffix

_rm
appended to the file name.

Do
not
check this box if you wish to perform

K Matrix Compression
because the

K Matrix Compression
process should be run on the original relationship matrix -- not the square root. The root of the compressed matrix will be computed in

K Matrix Compression
to meet the format requirements for the

Q-K Mixed Model
process.