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57
2007 Mar 01
1
covariance question which has nothing to do with R
This is a covariance calculation question so nothing to do with R but
maybe someone could help me anyway.
Suppose, I have two random variables X and Y whose means are both known
to be zero and I want to get an estimate of their covariance.
I have n sample pairs
(X1,Y1)
(X2,Y2)
.
.
.
.
.
(Xn,Yn)
, so that the covariance estimate is clearly 1/n *(sum from i = 1 to n
of ( X_i*Y_i) )
But,