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{{Citation| title = The Hat Matrix in Regression and ANOVA
| first1= David C. | last1= Hoaglin |first2= Roy E. | last2=Welsch
|journal= [[The American Statistician]] | volume=32
|id={{JSTOR|2683469}} | doi = 10.2307/2683469 |issue=1| url = http://jstor.org/stable/2683469| publisher = The American Statistician, Vol. 32, No. 1}}
</ref>
The diagonal elements of the hat matrix are the [[leverage (statistics)|leverage]]s, which describe the influence each observed value has on the fitted value for that same observation.
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