Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
More than two of every five students who enroll in college fail to graduate within six years. Peer tutoring offers one approach to improve learning outcomes in higher education. We conducted a randomized controlled experiment designed to increase take-up of university tutoring services. Brief, one-time messages increased tutoring take-up by seven percentage points, or 23% of the control group mean. Attendance at multiple tutoring sessions increased by nearly the same amount, suggesting substantial changes in study habits in response to a simple and inexpensive intervention. The intervention cost $3.32–$14.58 per additional tutoring hour, the lowest reported in the literature on peer tutoring experiments. We find little evidence of advertising-induced tutoring on learning outcomes.