From a Wall Street Journal story by Melissa Korn headlined “Some Ivy League Colleges Admit 4% of Applicants; Others Play Down How Selective They Are”:

When the University of Pennsylvania detailed this year’s undergraduate admission decisions, one data point was notably absent: the acceptance rate.

The eight Ivy League schools notified prospective students of their fates Thursday evening. This year, only five will also say publicly what share of applicants actually got in.

Penn, for instance, provided information on roughly how many people applied and how large it expects its first-year class to be. But not everyone admitted actually enrolls, so even enterprising readers will have trouble calculating the acceptance rate.