| filter_prop_zero | Filter Genes for by Max Proportion Zero Among Groups |
| get_prop_zero | Get the Proportion of Zero Counts for Each Gene in Each Group |
| rank_cells | Get the Rank of the Expression for each Gene in each Cell |
| rank_group | Get the Rank of the Mean expression for each Gene in each Group |
| rank_invariance | Calculate the Rank Invariance of Each Gene from Cell and Group Ranks |
| rank_invariance_express | Calculate the Rank Invariance of Each Gene from SCE object |
| sce_zero_test | Test SummarizedExperiment data |