comb.indices            Construction of selection indices based on
                        number of character grouping
gen.advance             Genetic Advance for PRE
gen.varcov              Genotypic Variance-Covariance Analysis
meanPerformance         Mean performance of phenotypic data
phen.varcov             Phenotypic Variance-Covariance Analysis
rcomb.indices           Remove trait or trait combination from possible
                        trait combinations of possible Trait
                        combinations
seldata                 Selection Index DataSet
weight                  Weight dataset
weight.mat              Convert dataframe to matrix
