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I guess this estimate would be useful a while ago. Now however a significant number of retired professors is replaced by adjuncts and postdocs instead. The academia is transforming, therefore looking at the current number of faculty positions does not tell you much about the job openings.Choppy said:Here's a little more on that "1 in 10" estimate.
According to the AIP, there are roughly 1600 PhDs awarded in the US in physics every year.
http://www.aip.org/statistics/trends/reports/physgrad2008.pdf
Further there are roughly 9400 physics full time equivalent faculty positions. Note that this includes positions where the highest degree the department confers is either a BSc or an MSc (about 3800 positions) and may be seen as "teaching" positions.
http://www.aip.org/statistics/trends/highlite/awf10/table1.htm
If we assume a 30 year career for a professor (starting at 35 and fnishing at 65), we might expect roughly 30*1600 = 48000 new PhDs over that time.
48000/9600 = 5.
I realize I've made some gross oversimplifications here. The number of physics graduates may not be stable over a 30 year period for example. But there you have it. Maybe it's a little better than I thought... but not enough to alter the advocacy for having a strong backup plan.
I also have a feeling that the process of academic casualisation is accelerating quite rapidly.