CORE GREML: MTG2 code and instruction

Linear mixed models (LMMs) using genome-based restricted maximum likelihood (GREML) allow both fixed and random effects. Classic LMMs assume independence between random effects, which can be violated. To relax the assumption, we introduced a generalised GREML, named CORE GREML, that explicitly estimates the covariance between random effects. This dataset includes MTG2 code and instruction for CORE GREML.