... which is based on the rate of response to resumes that were identical except for age, submitted to thousands of job openings.
There's also the whistleblower info that forms the basis of the RJ Reynolds lawsuit, which states they explicitly told recruiters to avoid experienced candidates in favor of people two or three years out of college.
This allegedly resulted in a unusually low number of people over 40 being hired (19 out of 1000). Similar statistics have been used recently in lawsuits against Yahoo and Google for alleged gender and age discrimination (still pending, afaik)
I actually do, but I'm eager to be convinced by facts.
How would you measure this? Does anyone do that?