The first concern is that schools that did or did not respond might have differed in ways correlated with enrollment, skewing our results. If, for instance, schools likely to have shrinking enrollment were less likely to answer our survey, our results would overstate increasing enrollment. Also, the Private School Review contact list no doubt is missing some schools. If those were more or less likely than institutions on the list to have increasing or declining enrollment, it would bias our results. Missing existing schools could be especially important with the surge in the growth of microschools, which are very small and might not be known to Private School Review. On the negative enrollment side, respondents almost certainly exclude closures, though we received emails from a few people letting us know their schools had closed. That would miss major enrollment losers. We also did not include schools without electronic contact available—email or telephone—which exist but likely serve communities, such as the Amish, that would tend to only have changing enrollment as a result of fluctuating numbers of school-age children, as opposed to parents sending children to different schools.
We have an indication that our sample is roughly representative of the country. Weighted state shares of schools in our sample and of private schools nationally are roughly the same. As of 2021, for instance, California accounted for about 11 percent of private schools while accounting for 10 percent of our sample. Florida accounted for nearly 9 percent of all private schools and 6 percent of our sample. Texas had 6 percent of all private schools and 8 percent of our sample.
Further bolstering confidence in our finding of increasing enrollment, Cato’s tracking of private school openings and closures—a project that compiles reports of permanently closing private schools and new private schools—shows a net gain of private schools between August 1, 2022, and July 31, 2023, supporting a likelihood that losses from closed schools not captured in our data collection do not outweigh gains in new schools not captured in the enrollment data. It is additional evidence that private schooling is expanding. That said, the data on our tracker of new school openings and existing school closings is derived only from media reports, so it also might miss many openings and closings.
Kayla Susalla contributed to this report. Any questions can be sent to Neal McCluskey, director of Cato’s Center for Educational Freedom.