I disagree with the parent comment's assumption that such data would necessarily be inaccurate. I found it to be quite accurate. I know that I and most of my immediate peers entered our salary data into the spreadsheet, and all of us did so accurately. There were detailed instructions telling you which internal website to go to to find out your compensation information, and the instructions said which values from that to fill into the spreadsheet.

Can you share the methodology of your study where you determined the data to be accurate?