added tree and imputation to methods
added tree and imputation to methods

AndersenLab/CeNDR,AndersenLab/CeNDR,AndersenLab/cegwas-web,AndersenLab/cegwas-web,AndersenLab/CeNDR,AndersenLab/cegwas-web,AndersenLab/cegwas-web,AndersenLab/CeNDR