差分

*Closeness of observed values '''to true population values'''

**AKA 'Trueness'

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!Precision

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*Closeness of observed values '''to each other among sample'''

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[[File:Accuracy and Precision 2.gif|none|400px]]

[[File:Accuracy and Precision 1.webp|none|400px]]

Precision in <math>x</math>-axis, Accuracy in <math>y</math>-axis

==Tips in Case-control design==