A table contains the sgRNA-level test result, and the table contains these columns:
`sgRNA`: The sgRNA identifier.
`gene`: The gene is the target of the sgRNA
`n_a`: The number of replicates of the first group.
`n_b`: The number of replicates of the second group.
`phat_a`: The proportion value of the sgRNA for the first group.
`phat_b`: The proportion value of the sgRNA for the second group.
`vhat_a`: The variance of the sgRNA for the first group.
`vhat_b`: The variance of the sgRNA for the second group.
`cpm_a`: The mean CPM of the sgRNA within the first group.
`cpm_b`: The mean CPM of the sgRNA within the second group.
`logFC`: The log fold change of sgRNA between two groups.
`t_value`: The value for the t-statistics.
`df`: The value of the degree of freedom, and will be used to calculate the p-value of the sgRNA.
`p_ts`: The p-value indicates a difference between the two groups.
`p_pa`: The p-value indicates enrichment of the first group.
`p_pb`: The p-value indicates enrichment of the second group.
`fdr_ts`: The adjusted P-value of `p_ts`.
`fdr_pa`: The adjusted P-value of `p_pa`.
`fdr_pb`: The adjusted P-value of `p_pb`.