Arguments. ▇▇▇▇ an ExpressionSet object carries the gene expression data (Exprs) and Phenotype data (pData) comp.var the column name or numeric index for group labels in pData of object ▇▇▇▇.▇▇▇▇ ▇▇▇▇.▇▇▇ a string definition of comparison, group labels connected by "-" gset.collection an object belongs to class GeneSetCollection The ExpressionSet includes two components: exprs: a matrix of expression values pData: a data frame contains the sample IDs and their assigned group labels. gset.collection contains a GeneSetCollection object defined in the Bioconductor package GSEABase. The gset.collection object must use the same identifiers for probe-sets as that used in the exprs com- ponent of ▇▇▇▇.▇▇▇▇.
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