Validating the regional estimates of changes in soil organic carbon by using the data from paired-sites: the case study of Mediterranean arable lands

Table 2 Results of the Shapiro–Wilk for the raw and log- transformed data of the 1994, 2008, and 2017

Shapiro–Wilk	Stat	Sign
Raw—LEG-SOC94^a	0.903	< 0.001
Raw—EST-SOC08^a	0.798	< 0.001
log-LEG-SOC94^a	0.980	< 0.001
log-EST-SOC08^a	0.883	< 0.001
Differences of raw data (EST-SOC08-LEG-SOC94)^a	0.961	< 0.001
Differences of log data (EST-SOC08-LEG-SOC94)^a	0.960	< 0.001
Raw—SOC94^b	0.833	< 0.001
Raw—SOC17^b	0.809	< 0.001
log—SOC94^b	0.951	0.183
log—SOC17^b	0.965	0.404
Differences of raw data (SOC17-SOC94)^b	0.886	0.004
Differences of log data (SOC17-SOC94)^b	0.824	< 0.001

According to the Shapiro-Wilk test, chosen the alpha level 0.05 and the p-value is less than 0.05, the null hypothesis that the data are normally distributed is rejected. If the p-value is greater than 0.05, then the null hypothesis is not rejected. Values in bold indicated normality
Please see Table 1 for a description of each dataset
^adegrees of freedom = 302
^bdegrees of freedom = 30

ISSN: 1750-0680