Dunn described to Campus Reform how difficult it was to find conservative professors to include in their study.
“To actually find conservatives in several disciplines we had to use what’s called a snowball sample,” he said. “That method is used with difficult-to-locate populations like the homeless. I think it is both telling and ironic that we had to use it with conservatives. With a snowball sample, you find someone in the population you’re looking for and ask them where you could find more people like them.”