reading this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4143681/pdf/1753-6561-8-S1-S28.pdf
Says the following: a transformation matrix was calculated as the inverse of the decomposition of the kinship matrix. Then, this transformation matrix was used to decorreate the family data by multiplying it with both the phenotype and genotypes matrices.
I did that on a non-normal phenotype, but I don't quite believe the results, because my dataset has some clear outliers and after the decorrelation, I lost some.
Is there someone who can validate this approach? searching I didn't find other papers that use the same methodology.