Update description for z-score plots

[skanwal]

Expand legend to clarify plots are using median values - because box plots describe medians.
This is as opposed to tables which are using mean.

Mean will be different from median for genes that have low expression across the cohort.

[JMarzec]

I afraid that it's more complex than that. Both, the plots ad the tables, present median values of Z-scores calculated for individual groups/patient. The key functions to look at are:

1. exprGroupsStats_geneWise.R ( https://github.com/umccr/RNAsum/blob/main/R/exprGroupsStats_geneWise.R ):

• that function returns two objects: (1) group_stats.list, which includes stats for individual genes calculated FOR EACH group, and (2) gene_stats.list, which seems to include stats for individual genes but calculated ACROSS all samples

2. exprTable.R ( https://github.com/umccr/RNAsum/blob/main/R/exprTable.R ):

• it uses the group_stats.list from exprGroupsStats_geneWise.R() function

3. cdfPlot.R ( https://github.com/umccr/RNAsum/blob/main/R/cdfPlot.R ):

• it it uses both the group_stats.list and gene_stats.list objects from exprGroupsStats_geneWise.R() function

I feel that the plots requires to provide values in the context of the entire cohort while the table provide stats (median values) for the group/patient.

[JMarzec]

Re the table legend it could be mentioned that the values refer to MEDIAN Z-score (or percentile) in the reference cohort and patient, e.g. for BRCA case in the Z-score tab it could look like (changes/additions in italics font):

In the BRCA (TCGA), Patient and the Diff columns the RED colour range indicate relatively high expression (median Z-score) values and BLUE colour range indicate relatively low expression (median Z-score) values in individual sample group. The BLANK cells with missing values indicate genes with no/low expression. The Diff (Patient vs BRCA (TCGA)) column illustrates the difference between median Z-scores in patient sample and reference cancer cohort for each mutated gene...