2-D and 3-D Trend Analysis - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 254

Fig. 7.14 (continued)

Table 7.2 Values of sample 3 as predicted by trend surfaces for the two control sample results
Mean Linear Quadratic Cubic Quartic

Sum of squares 1 0.46 0.32 0.12 0.18 0.11

2 0.40 0.27 0.13 0.10 0.11

Percentage ESS 1 0.0 30.2 73.8 60.3 76.5

2 0.0 34.2 68.5 74.6 72.6

Source: Agterberg ( 1970 , Tables 1 and 3)
Unit for sum of squares is 10 8

Table 7.3 Values of sample 3 predicted by kriging on deviations from mean and residuals
No. kriging Mean Linear Quadratic Cubic Quartic

Sum of squares 1 0.46 0.11 0.21 0.09 0.14 0.09

2 0.40 0.19 0.16 0.08 0.07 0.09

Percentage ESS 1 0.0 76.7 53.5 80.9 68.9 81.3

2 0.0 53.6 61.4 79.5 82.6 78.3

Ditto for residuals (Table 3) 1 33.3 27.0 21.4 20.4

2 41.4 34.6 31.1 20.0

Source: Agterberg ( 1970 , Table 5)