Improve tooltips for Altered and Unaltered group columns on comparison page

[alisman]

Example query

The frequencies listed in the Altered group and Unaltere group columns are percentage would appear to be a percentage of the overall number of samples in these respective groups. In fact, they are a percentage of samples what are profiled for the gene (corresponding to each row). For this reason, the denominator may change by row and the percentages can't always be compared row by row. We need to

• Edit the tooltip of the column headers to indicate this:
  Altered group: Number (percentage) of samples in Altered group that are profiled for, and altered in, listed gene.

• Add tooltip to each cell in row that indicates the same but prints the actual gene. E.g.:
  "Number (percentage) of samples in Altered group that are profiled for, and altered in, EGFR"

[alisman]

@jjgao please assign

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jjgao]

Good idea to make the tooltips more clear.

Here is a better example - genes with different denominators: https://bit.ly/45SpUMp - click Gene column to order.

I think we can add the denominators in the tooltip for the row, similar to the co-occurrence column, so instead of saying "Number (percentage) of samples in Altered group that are profiled for, and altered in, EGFR" we can say "x samples in Altered group are profiled for [gene name], y (z%) of which are altered in [gene name]"