Quantifying undergraduate participation in institutional research activities is challenging. This article describes an approach for estimating student participation in scholarly activities using a parametric model to follow the inflows and outflows of students in terms of classes (first-, second-, third-, and fourth-year students) and to control for duplications. The goal is to obtain a participation rate (among a graduating class) of students who have at any time participated in a scholarly activity. An example is presented for East Tennessee State University (ETSU). Model outcomes are compared and generally found to agree with averages from multiyear responses by ETSU with the National Survey of Student Engagement. The model is flexible to allow for application to diverse program designs.