Y is the n-dimensional vector of phenotype for individuals i = 1, n. Xl is the allelic dosage for SNP l. Tg is the predicted expression (or estimated GREx, genetically regulated expression). wlg are weights to predict expression \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$T_g = \mathop {\sum}\nolimits_{l \in {\mathrm{Model}}\,g} {w_{lg}X_l} $$\end{document}Tg= ∑l∈ModelgwlgXl, derived from an independent training set.
