Table 6 Results of the Wilcoxon tests of the mean difference of 30 samples of soil organic carbon measured in the 2017 (SOC17) and 1994 (SOC94) as difference of the raw data or log-transformed
Ranks | Raw | logs | ||||
|---|---|---|---|---|---|---|
N | Mean ranks | Sum of ranks | N | Mean ranks | Sum of ranks | |
Negative ranks (SOC17 < SOC94) | 18 | 14.42 | 259.5 | 16 | 12.75 | 204 |
Positive ranks (SOC17 > SOC94) | 12 | 17.13 | 205.5 | 12 | 16.83 | 202 |
Ties (SOC17 = SOC94) | 0 |  |  | 2 |  |  |
Test statistics based on positive ranks (Wilcoxon) | Â | Â | Â | Â | Â | Â |
Z based on negative ranks | − 0.556 |  |  | − 0.023 |  |  |
Asymptotic significance (2-tailed) | 0.578 | Â | Â | 0.982 | Â | Â |