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Briggs, D. C., & Wilson, M.. (2007). Generalizability in item response modeling. Journal of Educational Measurement, 44, 131–155.
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Briggs, D. C. (2004). Causal Inference and the Heckman Model. Journal of Educational and Behavioral Statistics, 29, 397-420. doi:10.3102/10769986029004397
Briggs, D. C. (2004). Evaluating SAT coaching: gains, effects and self-selection. Rethinking the SAT: The Future of Standardized Testing in University Admissions, 217–233.