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In the study of the RSD’s relationship to student achievement, a three-level hierarchical linear model was run to account for repeated measures and nested data. The level one analysis examined the influence of time on LEAP/iLEAP scores. The level two analysis examined the influence of student characteristics including race, gender, and free and reduced lunch status on student scores. The third level examined the influence of aggregated school level predictors including school type (RSD versus traditional public school) on student scores. Results indicate that student characteristics of disadvantage including minority status and low socioeconomic status are linked to lower test performance over time. This study offers a new method of analysis for the RSD and advances the literature.