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Understanding Sources of Internal Invalidity in Research Design and Testing

This document explores the critical sources of internal invalidity that can impact research outcomes. It covers the historical context of internal validity, the maturation of subjects during a study, and the effects of testing methodologies on results. Additionally, it discusses the role of statistical regression in data analysis, the importance of careful selection of participants, and the implications of mortality and attrition in longitudinal studies. By highlighting these factors, we aim to enhance the integrity and reliability of research findings.

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Understanding Sources of Internal Invalidity in Research Design and Testing

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  1. Sources of internal invalidity • History • Maturation • Testing • Instrumentation • Statistical regression • Selection • Mortality

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