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[求助] Mantel 检验中的r、P值

各位虫友，我用TFPGA软件进行Mantel test，结果如下
Analysis of E:\TFPGA11\MANTEL2.MAN
Comparison of two 15 x 15 matrices.

RESULTS FROM MANTEL TEST.

Correlation of two matrices: r = 0.4315

Z from original data: 7292.6020
Average Z after 999 permutations: 6325.4391

1 out of the 999 permuted data sets had Z-scores
greater than or equal to the original Z-score.
Upper tail probability: p = 0.0020

998 out of the 999 permuted data sets had Z-scores
less than or equal to the original Z-score.
Lower tail probability: p = 0.9990

出现两个P值，何解？？？？还是说这里的P值不是说明显著性的P值（<0.05）,需要另外算？？？？？

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