JSM 2013: Simultaneous Inferences


In a longitudinal cluster randomized trial, we investigate the impact of a new inquiry-based approach to teaching science, the Science Writing Heuristic, on students’ mathematics, reading, and science test scores. The study includes 48 elementary schools (clusters) from Iowa participating, with a total of roughly 2,300 students per grade (third, fourth and fifth) per year enrolled in these schools. We are primarily interested in the effect of the Science Writing Heuristic on student-level outcomes over time. A multivariate longitudinal regression model (Shah et al., 1997; Wu et al., 2009) is selected to simultaneously address correlation in the responses, non-ignorable missing data, and time dependence in the covariates.

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