60
2010
55
50
45
40
35
30
25
20
15
10
5
1
120
100
80
60
40
20
0
MAPE 284.622
MAD
1 3.719
MSD
4 63.939
Accuracy Measures
n
Ni
7.6
Actual
Fits
Variable
Spatial Analysis Plot for Ni
Linear Trend Model
Ni = 1.40 + 0.559×n
55
50
45
40
35
30
25
20
15
10
5
1
200
150
100
50
0
MAPE
405.88
MAD
1 9.86
MSD
1 216.05
Accuracy Measures
n
Ni(N)
4.7
Actual
Fits
Variable
Spatial Analysis Plot for Ni(N)
Linear Trend Model
Ni(N) = -3.73 + 0.781×n
45
40
35
30
25
20
15
10
5
1
140
120
100
80
60
40
20
0
MAPE 169.208
MAD
1 0.648
MSD
3 79.878
Accuracy Measures
Index
Ni_1
5.9
Actual
Fits
Variable
Spatial Analysis Plot for Ni_1
Linear Trend Model
Ni_1 = -1.61 + 0.618×n
(a)
(b)
(c)
Fig. 2.14 Spatial analysis plot of Ni (linear model). (a) 2015 Ni concentration data; (b) 2015 Ni
normalized concentration data; (c) 2010 Ni concentration data
S. Allajbeu et al.