Which columns of the relatedness data frame hold the
pair identifiers and the relatedness measure. Built by this constructor
rather than passed as a bare list so a misspelled field fails at the call
site instead of silently leaving the default in place.
Usage
RelatednessColumnsParam(
iid1 = "IID1",
iid2 = "IID2",
fid1 = NULL,
fid2 = NULL,
value = "PI_HAT"
)Value
A RelatednessColumnsParam object, a MethodParam.