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a
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
0
2
4
6
8
10
12
14
16
Lag (Interval = 2m)
Fig. 6.15 Whittle's 3-D correlogram fitted to Pulacayo zinc values. (a) Log
XY
plotted against
Lag distance (
X
); (b) Horizontal
line of Fig.
6.15a
in comparison with serial correlation
coefficients
theoretical correlogram (Fig.
6.15b
) is approximately hyperbolic. It primarily
differs from the semi-exponential model of Fig.
6.14
in the vicinity of the origin
where the autocovariance approaches
. Whittle's model produces a result that
resembles Matheron's linear semivariogram model and also two other models to be
1
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