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a
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
0
2
4
6
8
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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
discussed in Sects. 6.2.5 and 11.6.3 , respectively.
1
 
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