There are several errors in mathematical expressions in the
Introduction under the subheading GWAS Plus: GCTA. In the final sentence of the second paragraph, the expression for the distribution of u is incorrect. The subscript n should be an m and the subscript epsilon should be a u. The correct distribution is: . In the second sentence of the sixth paragraph, the expression for the distribution of g is incorrect. The subscript epsilon should be a g. The correct distribution is: .