filter a dosage matrix by minor allele frequence. get a vector of allele frequences from a dosage matrix
maf_filter(M, thresh)
M | dosage matrix. Assumes SNPs in M coded 0, 1, 2 (requires rounding dosages to integers). M is Nind x Mrow, numeric matrix, with row/columanes to indicate SNP/ind ID |
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thresh | threshold value. Columns of M with maf<thresh will be removed |
dosage matrix potentially with columns removed