avg_expression          Function to Calculate the Average of Gene
                        Expressions
check_gene_name_match   Function to Check if Gene IDs in the Input Gene
                        Data Match Well
check_gene_name_match_noDir
                        Function to Check if Gene IDs in the Input Gene
                        Data Match Well When Direction Matrix Is
                        Missing
check_genes_missing     Function to Check if Genes in Gene Sets Have
                        Missing Information in Data Matrix and
                        Direction Matrix
check_genes_missing_noDir
                        Function to Check if Genes in Gene Sets Have
                        Missing Information in Data Matrix
check_genes_missing_total
                        Function to Check if 100% of Genes in Gene Sets
                        Have Missing Information in Data Matrix
data_matrix             This is data to be included in package
data_matrix_entrezID    This is data to be included in package
direction_matrix        This is data to be included in package
gene_sets               This is data to be included in package
median_expression       Function to Calculate Median of Gene
                        Expressions
ssGSA                   Function to Calculate Single Sample Gene Set
                        Scores without Direction Matrix
ssdGSA                  Single Sample Directional Gene Set Analysis
                        (ssdGSA)
ssdGSA_individual       Single Sample Directional Gene Set Analysis
                        Using Individual Weighted Scores
transform_ensembl_2_entrez
                        Function to Transform ENSEMBL ID to ENTREZ ID
