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Glossary

Internal Validity (Evidence Rating Element)
The degree to which observed changes can be attributed to the program. The validity of a study depends on both the research design and the measurement of the program activities and outcomes. Threats to internal validity may affect the extent to which observed effects may be attributed to a program or intervention, on CrimeSolutions.gov’s Scoring Instrument, which includes: Attrition, Maturation, Instrumentation, Regression toward the Mean, Selection Bias, Contamination, and History, as well as other factors. See Program Review and Rating from Start to Finish for more information.

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