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Internal means factors or components within a business that can be controlled and external is the exact opposite. External factors, economy, competitors etc... Internal means something done from the inside and external means the opposite, something done from the outside.
Internal validity means. that the study measured what it set out to; external validity is the ability to generalise from the study to the readerâs. patients. With respect to internal validity, selection bias, information bias, and confounding are present to some. degree in all observational research. Selection bias stems from an absence of comparability between groups being. studied. Information bias results from incorrect determination of exposure, outcome, or both.