Question

?1=[Σn?=1 ( ?i −?̅ ) ( ?i−?̅ ) / ???] = Σn?=1 ?? ( ?i−?̅ ),?ℎ???...

?1=[Σn?=1 ( ?i −?̅ ) ( ?i−?̅ ) / ???] = Σn?=1 ?? ( ?i−?̅ ),?ℎ??? [?i= (?i −?̅ ) / ???]


We can prove: ?1 =Σn?=1 ???? ?ℎ??? ?? ????????? ?????.

????? ?ℎ? ?????????

(?) Σn?=1 ?? =0

(?) Σn?=1 ?? ?? =1

(?) ?(?1)= ?1

(?) Σn?=1 ?i2 = (1 / ???)

(?) ???(?1) =?2 / ???; ????: ???(?i)=?2

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