Table 3.

Effect of outlier elimination based on the Euclidean distance of a data point to the center of the principal component space, comparison of coefficients of determination for PLSR.

Soil Parameter	All Spectra	5% Removal	20% Removal	50% Removal
Ca	0.71	0.66	0.51	0.52
Mg	0.73	0.73	0.73	0.72
K	0.60	0.60	0.60	0.54
N	0.48	0.47	0.48	0.43
P	0.18	0.24	0.28	0.22
Fe	0.69	0.70	0.68	0.66
Mn	0.15	0.14	0.15	0.13
Al	0.72	0.73	0.72	0.69
P (pa)	0.25	0.27	0.30	0.24
Humus	0.58	0.63	0.55	0.58
pH	0.86	0.85	0.85	0.83
mean	0.54	0.55	0.53	0.51