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https://nesslabs.com/wp-content/uploads/2020/07/mental-models-validity-reliability.png
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{{Epi StatFloating_Menu}}
==Disease frequency measurement==
==Difference between Population and Sample==
===Accuracy/=Validity and Precision/=Reliability===
{|class="wikitable"
|+Definition
|-
!Accuracy = !!Validity
|
*Closeness of observed values '''to true population values'''
**AKA 'Trueness'
|-
!Precision = !!Reliability
|
*Closeness of observed values '''to each other among sample'''
|}
https://i0.wp.com/xpslibrary.com/wp-content/uploads/2019/07/Accuracyvs.PrecisionABCDHighAccuracyHighPrecision.jpg
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==Tips in Case-control design==
