[belorn]

The Campus Climate Survey Validation Study has on page 18 a summery of the result for undergraduate females during 2014-2015 in the 9 schools:

Estimated sexual assault: Averaged 10.3%, and ranged from 4.2% at School 2 to 20.0% at School 1.

Estimated sexual battery: Average 5.6% , and ranged from 1.7% at School 2 to 13.2% at School 1.

Estimated rape: Average 4.1%, and ranged from 2.2% at School 9 to 7.9% at School 5.

Across the nine participating schools, 4.3% of sexual battery incidents and 12.5% of rape incidents were reported by the victim to any official.

So according to it, the average rape on those 9 schools were 4.1%, but only 0.5% were reported. If we accept those numbers (54% response rate, common location and (likely) background, generational age), we have that out of 150 women that this article talk about, 6 women is estimated to have been raped, in contrast to the initial assertion of 30. The "1 in 5" study was a good signal that further studies was needed. The CCSVS can be seen as a good start of such further studies. The range difference of 400% between school 9 and 5 do say that we need to be careful and bigger studies/meta studies is needed to remove outlines and get averages and median value. In the mean time I suggest the nice and round number 5%, or if the assume that the above numbers are exclusive (uncertain if thats true), 20% that a undergraduate will be victim of some form of sexual misconduct.