Estimates of External Validity Bias When Impact Evaluations Select Sites Nonrandomly

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 co...

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Veröffentlicht in:	Educational evaluation and policy analysis 2016-06, Vol.38 (2), p.318-335
Hauptverfasser:	Bell, Stephen H., Olsen, Robert B., Orr, Larry L., Stuart, Elizabeth A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Arizona Colorado Computation Delaware Estimation bias Florida Georgia Hawaii North Carolina Outcome Measures Performance evaluation Program Evaluation Reading Programs Sampling School Districts South Carolina Statistical Bias Texas Validity
Online-Zugang:	Volltext
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