Dear Colleagues
I would greatly appreciate it if someone could shed some light on the
following issue:
For a nonstationary random function, variogram is defined as:
2*\gamma(x,x')=VAR[Y(x)-m(x)-Y(x')+m(x')]
If one simplifies the right hand side, the whole equation becomes:
2*\gamma(x,x')=R(x,x)+R(x',x')-2*R(x,x')
In a number of textbook, relation between covariance and variogram is
written as:
2*\gamma(x,x')=R(x,x)+R(x',x')-2*R(x,x')+[m(x)-m(x')]^2
Am I missing something from this mathematical manipulation?
Thanks
Abedini
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