Geoscience Reference
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Fig. 3.5 Maximum
likelihood methods of
Fig.
3.4
used for estimating
mean age of stage boundary
in Run 1. (a) All dates;
(b) Inconsistent dates only
(Source: Agterberg
1990
,
Fig. 3.16)
a
m
−
s
m
m
+
s
−
6
−
7
−
8
y
y
y
y
y
o
o
o
−
9
4.0
4.5
5.0 5.5
Simulated geologic time
6.0
6.5
7.0
b
yy
y
y
y
o
o
o
m
m
+
s
m
−
s
5
4
3
2
4.0
4.5
5.0
5.5
6.0
6.5
7.0
Simulated geologic time
Table 3.3 Summary of results for rst 10 runs of computer simulation experiment
Maximum likelihood method
Gaussian weighting function
Run
Parabola
Scoring
Parabola
Scoring
No. Mid-point Mean
S.D. Mean
S.D. Mid-point Mean
S.D.
Mean
S.D.
1
5.6
5.582
0.479
5.554
0.481
5.3
5.269
0.470
5.260
0.500
2
5.7
5.632
0.481
5.663
0.489
6.3
6.190
0.480
6.264
0.500
3
5.1
5.153
0.420
5.142
0.423
4.8
4.884
0.335
4.828
0.316
4
4.5
4.506
0.447
4.507
0.452
4.2
4.321
0.395
4.216
0.354
5
5.1
5.070
0.461
5.089
0.466
5.3
5.217
0.482
5.293
0.408
6
4.4
4.419
0.502
4.448
0.505
4.6
4.625
0.749*
7
5.7
5.710
0.531
5.728
0.542
5.8
5.767
3.924*
8
5.2
5.205
0.406
5.200
0.411
5.0
5.025
0.364
5.017
0.408
9 5.0 5.022 0.417 5.018 0.419 5.0 4.966 0.614*
10 4.2 4.231 0.609 4.232 0.623 4.3 4.248 1.001*
Comparison of estimates obtained by tting parabola and scoring method, respectively. Standard
deviations marked by asterisks are too large (Source: Agterberg
1990
, Table 3.4)
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