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Please use some common sense in links. OBVIOUSLY one would not expect an article titled contrast to be on the topic of contrast (statistics). |
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{{Merge to|Contrast (statistics)|discuss=Talk:Contrast variable#Merge discussion |date=July 2011}}
In [[statistics]], a '''contrast variable''' is a [[linear combination]] of [[random variable]]s in which the sum of the coefficients is zero<ref name=ZhangPharmacogenomics2009>{{cite journal |author=Zhang XHD
|title= A method for effectively comparing gene effects in multiple conditions in RNAi and expression-profiling research
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