The data on staff engineer salaries at Google seems very off. The total comp for staff is $580K with a breakdown of total comp with being a 200K base, a 200K bonus, and 172K of stock. I would be surprised if the average staff engineer gets a bonus that is at 100% of their salary level. I guess this is the issue with user submitted data.

You could add h1 salary info (which is publicly available) to improve accuracy on the base compensation portion.