Question: h a t ( ) 1 s . e ( h a t ( ) 1 ) = r n - 2 2 1 -

hat()1s.e(hat()1)=rn-221-r22Using R coding system, how to prove this equalities in R markdown by coding?
hat()1s.e(hat()1)=rn-221-r22Using R coding system, how to prove this equalities in R

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