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!=Validity
!=Reliability
[[Filehttps:Accuracy and Precision 2//i0.wp.com/xpslibrary.gif|float|400px]]Accuracy in <math>x<com/math>wp-axis, Precision in <math>y<content/math>-axisuploads/2019/07/Accuracyvs.PrecisionABCDHighAccuracyHighPrecision.jpg
[[File:Accuracy and Precision 1.webp|none|400px]]Precision in <math>x</mathdiv>-axis, Accuracy in <mathdiv style="clear:both;">y</mathdiv>-axis
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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'''
|}
<div style="display:inline; vertical-align:bottom;">[[File:Accuracy and Precision 2.gif|thumb|left|500px|Accuracy in <math>x</math>-axis, Precision in <math>y</math>-axis<br><nowiki>*</nowiki>In this example, μ is sample mean, not the population mean]][[File:Accuracy and Precision 1.webp|thumb|none|300px|Precision in <math>x</math>-axis, Accuracy in <math>y</math>-axis]]
==Tips in Case-control design==
