School Participation Rate (SPR) is a basic indicator used to measure access to education, especially for the school-age population. Riau has fluctuating SPR data for senior high school level. In this study, the nonparametric Multivariate Adaptive Regression Splines (MARS) method was used to model the high school participation rate in the Regency/City of Riau Province in 2015-2019. Factors t…