Table 5: Calibration and validation performance statistics of laboratory spectra.

ParameterClay
Model nameNumber of samples
(cal/val)
PreprocessingNumber of LVSDcalSDval SECSD/SECSEPRPD

Lab_2004_Clay20/115Absorption648.2175.210.7629.301.6526.592.54
Lab_2005_Clay38/97First derivative of absorption549.3270.060.9017.422.8720.773.25
Lab_2005_Clay38/29First derivative of absorption549.3248.080.9017.422.8719.482.69
Lab_2008_Clay11/124Absorption539.9269.180.7035.681.2835.551.86

ParameterOrganic carbon
Model nameNumber of samples
(cal/val)
PreprocessingNumber of LVSDcalSDval SECSD/SECSEPRPD

Lab_2004_OC20/115Absorption22.533.770.512.361.342.361.71
Lab_2005_OC38/97Absorption62.873.900.881.112.671.922.16
Lab_2005_OC38/29Absorption62.872.630.881.112.671.941.93
Lab_2008_OC11/124First derivative of absorption41.494.120.780.971.522.461.58

SD: standard deviation of estimated parameter values in (g kg−1), : coefficient of determination, SEC: standard error of calibration in (g kg−1), SEP: standard error of validation in (g kg−1), RPD: ratio of performance to deviation.