Table 4:
Number of latent PLSR variables, coefficient of determination (
), adjusted
, and relative root mean square error (%RMSE) for the selected PLSR models of chemical constituents of the Podzol.
Al
Fe
Mn
C
N
7
7
7
5
4
0.81
0.82
0.55
0.49
0.36
adj.
0.76
0.77
0.44
0.40
0.27
%RMSE
34.3
32.1
28.8
58.9
75.3
5
5
5
4
4
SNV-DT
0.79
0.83
0.55
0.51
0.36
adj.
0.76
0.81
0.47
0.45
0.28
%RMSE
36.0
30.9
28.6
56.6
71.2
5
5
4
1
1
Diff
0.78
0.79
0.51
0.41
0.31
adj.
0.74
0.75
0.45
0.40
0.28
%RMSE
36.9
34.8
29.6
61.3
71.0
4
3
4
3
1
2nd Diff
0.76
0.78
0.56
0.53
0.23
adj.
0.73
0.76
0.51
0.49
0.20
%RMSE
38.8
35.3
28.0
55.3
75.2
3
6
5
1
1
CR
0.84
0.78
0.49
0.56
0.28
adj.
0.82
0.73
0.40
0.54
0.26
%RMSE
31.4
36.1
31.0
53.2
72.3
6
6
7
7
3
NCR
0.78
0.77
0.61
0.71
0.28
adj.
0.73
0.72
0.51
0.64
0.21
%RMSE
37.6
36.9
26.9
42.9
74.7
6
5
6
6
5
MSC
0.81
0.82
0.53
0.52
0.43
adj.
0.77
0.79
0.44
0.42
0.33
%RMSE
34.7
31.7
29.3
57.1
68.4
5
4
8
5
4
EMSC
0.80
0.77
0.57
0.49
0.41
adj.
0.76
0.73
0.44
0.41
0.33
%RMSE
35.4
36.8
28.1
58.1
66.2