[stepny]

It's possible that some of the data came from that spreadsheet. The sources of the data are cited at the bottom of the post. You're right that it is all self-reported and unverified. We tried to clean and standardize the data as best we could. The biggest source of error for us in the process might have been the level, particularly because some of the reported bonuses and stock compensation seemed out of line with the stated level. But we took the Level as it was in almost all cases. It may very well be that companies overpay in certain circumstances.