I am wondering whether there are some available sources for statistics on the average number of PhD students and postdocs by Professor/supervisor across different fields, universities or countries?

I have the impression that some fields/universities favor a "chair" or "lab" system where one Professor supervises a large number of PhD and postdocs students, whereas others have a more "department" style with more Professors, but I haven't found any data/study that discusses this aspect?

Related yet distinct discussions on Academia:

  • Funding constraints (which have country, field, and local factors) are very important.
    – Jon Custer
    Commented Nov 2, 2023 at 13:48
  • 1
    Overall statistics are probably meaningless. There would be a vast difference, I think, between math and, say, organic chemistry. Moreover, in the lab situation, advising may be a shared responsibility. A PI there might be the advisor of record, but with little actual contact.
    – Buffy
    Commented Nov 2, 2023 at 14:05


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