Non-response bias in student evaluations of teaching

In this paper, we gather a unique data set from individual students who provide either online SET forms or in-class SET forms. We use these responses to address the concerns regarding the validity of SET data which results from the low response rates often associated with online SET evaluations. The Heckman (1979) sample selection bias correction estimator is used to quantify the bias resulting from the low online response rate and finds this bias to be negligibly small.