Quantitative Estimation of Organic Matter Content in Arid Soil Using Vis-NIR Spectroscopy Preprocessed by Fractional Derivative

Table 1

The statistical characteristics of organic matter content of soil samples (g kg⁻¹).

Type of samples	Observations	Min	Max	Mean	Standard error	Standard deviation	Coefficient of variation
Whole set	103	0.68	78.39	21.43	1.07	10.81	50.46%
Calibration set	69	0.68	78.39	21.69	1.39	11.56	53.32%
Validation set	34	4.79	39.16	20.90	1.59	9.24	44.22%