I recently saw this infogram circling around various social networks:

![enter image description here](https://i.stack.imgur.com/06n84.jpg)

It appeared in [this Tweet](https://twitter.com/AdamGDunn/status/432520636716441600/photo/1) with the following claim:

> 
> Got a PhD? Your chance of becoming a Professor is 0.45%. Good luck.
> 
> 
> 

Being a bit sceptical of the claim and of shiny info-grams in general, I traced the image back through [this blog](http://occamstypewriter.org/athenedonald/2014/02/08/thinking-about-the-pipeline/) to [this report](http://royalsociety.org/uploadedFiles/Royal_Society_Content/policy/publications/2010/4294970126.pdf) by the Royal Society (see page 14), featuring various reputable academics in the introduction. The report cites a number of other reports from UK organisations as its source (I did not dig deeper). The infogram seemingly pertains to graduates of PhDs in the UK in STEM fields.

I find the figures literally incredible. I cannot believe them. Fewer than 1-in-200 PhD graduates become professors? This would imply, for example, that STEM professors in the UK would need to graduate 200 PhD students just to "repopulate" themselves.

I would like to compare these estimates with figures sourced elsewhere. And so my question is: 

**Are any other studies or sources of data for estimating the number of PhD graduates who end up with professorships?** (... preferably within the STEM areas and not restricted to the UK)

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There is a related question specifically for the maths field and referring to tenure-track positions but none of the answers really address this question: [What percentage of phds in math actually get a tenure track academic job?](https://academia.stackexchange.com/questions/8236/what-percentage-of-phds-in-math-actually-get-a-tenure-track-academic-job)

EDIT: Pointer to a follow-up question asked by @gerrit: [How many PhD students does a typical STEM professor graduate during their entire career?](https://academia.stackexchange.com/questions/17461/how-many-phd-students-does-a-typical-stem-professor-graduate-during-their-entire/18096)