In Philosophy, Departments with More Women Faculty Award More PhDs to Women (Plus Some Other Interesting Facts)

Women constitute about 32% of Philosophy Bachelor's degree recipients in the U.S., about 29% of Philosophy PhD recipients, and about 20-25% of philosophy faculty. (Paxton et al 2012; Schwitzgebel and Jennings 2017). It is sometimes suggested that the relatively low percentage of women faculty in philosophy explains the relatively low percentage of women who major in philosophy (which then in turn explains the relatively low percentage of women who become the next generation of philosophy faculty).

I was curious whether philosophy departments with a relatively high percentage of women faculty would also have a relatively high percentage of students who are women. Maybe departments with more women faculty are more "woman friendly", with a visible effect on the proportion of women who complete the Bachelor's or PhD?

Paxton et al. 2012 provide some evidence of a relationship between departments' proportion of women faculty, women undergraduates, and women graduate students. In a sample of 49 departments, they found a substantial correlation between the percent of women faculty and the percent of undergraduate philosophy majors who are women (r = .45, p = .012). However, in a similar sample of 31 departments, they did not report finding such a correlation between percent of faculty who are women and percent of PhD students who are women.

There are a few limitations in the Paxton et al. study. First, thirty-one departments is a somewhat small number for such an analysis, yielding only limited statistical power to detect medium-sized correlations (note that with 49 departments in their undergraduate analysis, Paxton et al's p-value was greater than .01 despite a correlation of .45). Second, the sample of departments might be unrepresentative. And third, the proportion of women who complete the PhD might be a better measure of women-friendliness or women's success than proportion enrolled in the PhD program, since a substantial proportion of philosophy PhD students do not complete their degrees (in many departments completion rates are around 50%) and (anecdotally) non-completion rates might be higher for women than men (I welcome pointers to systematic data on this).

For these reasons, I decided to examine whether in a larger sample of PhD-granting philosophy departments in the U.S., the percent of women faculty would correlate with the percent of women completing the PhD.

For the data on students, I relied on the IPEDS database from the National Center for Educational Statistics, using an eight-year time frame from the academic year 2009-2010 to 2016-2017. For faculty, I used Julie Van Camp's counts of women faculty and total faculty in 97 doctoral programs in the U.S. from January 2006 and January 2015, as recovered through the Wayback Machine Internet Archive. (These 97 programs produce about 95% of the Philosophy PhDs in the U.S. ETA: This includes tenured and tenure-track faculty only.) For each department women faculty percentage score, I averaged the percentage of women faculty in 2006 and in 2015 to reduce noise due to temporary gains and losses. (My own department, for example, had 2/17 [12%] women faculty in 2006 and 4/19 [24%] in 2015, and is probably better represented by 18% than by either the higher or the lower number.)

Overall, women were 20% of faculty in 2006 (340/1669) and 25% of faculty in 2015 (442/1755), a statistically significant increase (z = 3.4, p = .001). Although 20% to 25% may not sound like much, it is actually quite remarkable for such a short period. The faculty growth between 2006 and 2015 in this set of universities was only 86 positions (from 1669 to 1755 total faculty), while the growth of women faculty was 102 positions.

The pattern in undergraduate Bachelor's degree completions in these same institutions is in some ways similar. Among these 97 institutions, the percentage of women earning BAs increased from 29% (1066/3618) to 34% (957/2787). This is statistically significant (z = 4.1, p < .001), and intermediate years show a slow steady increase (30%, then 31%, then 32%). However, it is possible that this is just a brief fluctuation in a long-term trend, in which percentage of women among philosophy majors has held approximately steady at 30-34% since at least 1986. Also notable: While faculty numbers increased, graduating majors decreased (fitting with national trends across all university types).

The pattern in PhD completions is approximately flat over the period (fitting with results from the NSF reported here), fluctuating between 25% and 33% women -- coincidentally, 27% both at the beginning (100/372) and at the end (113/415) of the period. However, with numbers this low, statistical power is an issue.

The main question I was looking at was correlational: Do the universities with a higher proportion of women faculty tend to have a higher proportion of women completing their PhDs? And the answer is...

Yes!

Here it is as a chart:

[apologies for blurry image: click to clarify and enlarge]

The correlation is substantial r = .42 (p < .001). For example, although only 37 of the 97 universities had over 25% women faculty, all ten of the universities that had the highest proportion of women among their Philosophy PhD recipients did.

Oddly, however, for Bachelor's degrees, I can find no relationship at all, with a correlation of r = -.01 (p = .96). This result contrasts sharply with the Paxton et al. results, and I'm not sure what to make of it. A follow-up study might look at a broader sample of undergraduate institutions to see what sort of relationship there is between percent of women faculty and percent of women undergraduates in philosophy and whether it might vary with institution type.