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Line 1: In [[statistics]], the '''hat matrix''', '''H''', relates the fitted values to the observed values. It describes the influence each observed value has on each fitted value<ref name="Hoaglin1977"> {{Citation\| title = The Hat Matrix in Regression and ANOVA \| first1= David C. \| last1= Hoaglin \|first2= Roy E. \| last2=Welsch

Projection matrix: Difference between revisions