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Direct linkBell, Stephen H.; Olsen, Robert B.; Orr, Larry L.; Stuart, Elizabeth A. – Educational Evaluation and Policy Analysis, 2016
Evaluations of educational programs or interventions are typically conducted in nonrandomly selected samples of schools or districts. Recent research has shown that nonrandom site selection can yield biased impact estimates. To estimate the external validity bias from nonrandom site selection, we combine lists of school districts that were…
Descriptors: Computation, Validity, Program Evaluation, Sampling
Rios-Aguilar, Cecilia; Gonzalez Canche, Manuel S.; Moll, Luis C. – Teachers College Record, 2012
Background/Context: Arizona's most recent English Language Learner (ELL) legislation, starting in the school year 2008-2009, requires all such students be educated through a specific Structured English Immersion (SEI) model: the 4-hour English Language Development (ELD) block. The basic premise behind this particular model is that ELL students…
Descriptors: Limited English Speaking, English Language Learners, School Districts, Models
Download full textOlsen, Robert B.; Unlu, Fatih; Price, Cristofer; Jaciw, Andrew P. – National Center for Education Evaluation and Regional Assistance, 2011
This report examines the differences in impact estimates and standard errors that arise when these are derived using state achievement tests only (as pre-tests and post-tests), study-administered tests only, or some combination of state- and study-administered tests. State tests may yield different evaluation results relative to a test that is…
Descriptors: Achievement Tests, Standardized Tests, State Standards, Reading Achievement
