Re: AI-GEOSTATS: Unbaisedness

[Isobel Clark]

No, average of (Z*-Z) is zero

average of (sum wZi - Z i)s zero

sum wi times average of Z - average if Z =0

if sum w = 1 then this is true, otherwise not

 

Says nothing at all about the average of Z.

 

OK?

Isobel

Digby Millikan <[EMAIL PROTECTED]> wrote:

BLUE : “Best Linear Unbiased Estimator”

 

 Best :         Minimium error variance.

 Linear :       Linear combination of sample values.

 Unbiased :  E(Z*-Z) = 0

 Estimator:  An estimate

 

 Is unbiasedness a fas? E(Z*-Z) = 0

                                   E(sumwZ(x) – Z) = 0

                                   sumwu – u =0  says all Z(x) =u this is not true?