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Table 4 Anderson-Darling statistical output for comparisons of burned and unburned samples (see Fig. 6 and Table 3), for the Madrean Ecoregion Sky Islands, US and Mexico. The standard deviation for the Anderson-Darling test statistic (AD.T) was 0.76, and the null hypothesis that all samples came from a common population was rejected in all comparisons (P < 0.001). Variables with density plots in Fig. 6 are shown in bold. Number of ties refers to the number of times identical values occur in the data. If too many ties occur, there will be a rejection of the null hypothesis and the result will suggest non-normality

From: Distant neighbors: recent wildfire patterns of the Madrean Sky Islands of southwestern United States and northwestern Mexico

Variable US Mexico
number of ties AD.T number of ties AD.T
Road density 12091 144.57 23579 240.86
Population density 4189 114.84 8005 406.53
Terrain ruggedness 4092 466.68 7980 718.02
Lightning flash date 12191 358.16 23579 583.9
AHM 0 1203.7 0 1995.4
bFFP 486 753.27 598 2913.2
CMD 0 894.15 0 2690.6
DD_0 832 829.36 2171 2761.7
DD_18 0 881.7 0 2982
DD18 0 960.42 0 3239.8
DD5 0 934.04 0 3150.1
eFFP 1453 666.9 2233 2447.1
EMT 199 677.34 85 2367.5
Eref 2 607.38 0 3172.2
EXT 51 981.68 113 3069.2
FFP 216 736.15 256 2748.7
MAP 4 1079.3 2 528.65
MAT 194 932.23 141 3137.8
MCMT 539 786.1 251 2530.3
MSP 5 1021.7 28 128.37
MWMT 78 986.16 105 3035
NFFD 348 705.34 666 2678.3
PAS 6472 1118.2 17124 3853.6
PPT_sm 25 972.95 51 78.771
PPT_wt 144 569.68 263 1061.5
RH 3831 59.104 13584 23.661
SHM 0 1134.5 0 1137.3
Tave_sm 93 972.75 103 3190.6
Tave_wt 481 820.88 228 2721.8
TD 485 451.81 1111 134.93