Objective: Superiority experiments supply a critical lens to probe higher education interventions because they can dismantle the collective effect of a program and identify the relative contribution of the core components. However, such lines of inquiry are generally absent in higher education literature. We draw on experimental data to probe the…

We aimed to compare the findings of three research designs to bracket effect estimates of a strongly worded warning letter delivered by certified mail to students on academic probation. We embedded an experiment within a regression discontinuity design and calculated two achievement estimates, average GPA and percentage of students remaining on…