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Chance, Bias & Confounding (Validity (Validity is the degree to which…
Chance, Bias & Confounding
Precision
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Precision gives as a margin between which we have some confidence our source population parameter sits within, based on our sample estimate
Validity
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- Bias will always be there, we need to MINIMISE it as best we can
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External Validity: This is the extent to which the results obtained from the sample in the study can be generalised
Random Error
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- Sample may not be completely representative of our source population
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Controlling RE
- efficient study design that maximises information
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