42
P. Lazo et al.
45
40
35
30
25
20
15
10
5
1
40
35
30
25
20
15
10
MAPE 22.9931
MAD
4.5844
MSD
29.3298
Accuracy Measures
n
Sr
Actual
Fits
Variable
Spatial Analysis Plot for Sr
Linear Trend Model
Sr = 23.3 - 0.0817×n
Fig. 3.12 Spatial analysis plot of Sr
3.4.9 Tantalum, Ta
Ta is another typical crustal element that can be found in the earth’s crust, in rocks,
and different ore minerals. It shows a moderate variation (CV % = 52%) in present
moss samples. Its content ranged from 0.013 to 0.29 mg kg
−1 in moss samples. The
spatial analysis of Ta (linear model) (Fig. 3.13) shows an increase from the south to
45
40
35
30
25
20
15
10
5
1
0.30
0.25
0.20
0.15
0.10
0.05
0.00
MAPE 59.1316
MAD
0.0278
MSD
0.0018
Accuracy Measures
n
Ta
Actual
Fits
Variable
Spatial Analysis Plot for Ta
Linear Trend Model
Ta = 0.045 + 0.00066×n
Fig. 3.13 Spatial Analysis plot of Ta