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Litwok, Daniel; Peck, Laura R. – American Journal of Evaluation, 2019
In experimental evaluations of policy interventions, the so-called Bloom adjustment is commonly used to estimate the impact of the treatment on the treated. It does so by rescaling the estimated impact of the intention to treat--that is, the overall treatment-control group difference in outcomes for the entire experimental sample--by the…
Descriptors: Computation, Outcomes of Treatment, Program Evaluation, Scaling
Reardon, Sean F. – Education and the Public Interest Center, 2009
"How New York City's Charter Schools Affect Achievement" estimates the effects on student achievement of attending a New York City charter school rather than a traditional public school and investigates the characteristics of charter schools associated with the most positive effects on achievement. Because the report relies on an…
Descriptors: Charter Schools, Academic Achievement, Achievement Gains, Achievement Rating

Bamezai, Anil – Evaluation Review, 1995
Some of the threats to internal validity that arise when evaluating the impact of water conservation programs during a drought are illustrated. These include differential response to the drought, self-selection bias, and measurement error. How to deal with these problems when high-quality disaggregate data are available is discussed. (SLD)
Descriptors: Conservation (Environment), Drought, Error of Measurement, Evaluation Methods
Mandeville, Garrett K. – 1978
The RMC Research Corporation evaluation model C1--the special regression model (SRM)--was evaluated through a series of computer simulations and compared with an alternative model, the norm referenced model (NRM). Using local data and national norm data to determine reasonable values for sample size and pretest posttest correlation parameters, the…
Descriptors: Analysis of Covariance, Error of Measurement, Intermediate Grades, Mathematical Models