Threats to the Internal Validity of Experimental and Quasi …
https://www.researchgate.net/profile/Kevin-Flannelly/publication/322690724_Threats_to_the_Internal_Validity_of_Experimental_and_Quasi-Experimental_Research_in_Healthcare/links/5a6f6d27aca272e425eaa697/Threats-to-the-Internal-Validity-of-Experimental-and-Quasi-Experimental-Research-in-Healthcare.pdf
WEBThe article defines, describes, and discusses the seven threats to the internal validity of experiments discussed by Donald T. Campbell in his classic 1957 article: history, …
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