It's ranking on how free you are to speak, not on how you are taught about free speech (if at all). It's looking at things like what percent of students say it

It's ranking on how free you are to speak, not on how you are taught about free speech (if at all). It's looking at things like what percent of students say it is OK to shout down speakers to prevent them from speaking, what percent of students say they have to self-censor at least monthly, what percent say they are worried about reputation damage from someone misunderstanding something they say or do, how tolerant the school is to speakers based on political leaning, and some others.