Fisher's Exact Test即 Fisher's确切检验SAS结果怎么读,

Fisher's Exact Test即 Fisher's确切检验SAS结果怎么读,
结果：
Statistics for Table of r by c
Statistic DF Value Prob
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Chi-Square 1 0.4381 0.5080
Likelihood Ratio Chi-Square 1 0.4710 0.4925
Continuity Adj.Chi-Square 1 0.1429 0.7054
Mantel-Haenszel Chi-Square 1 0.4374 0.5084
Phi Coefficient 0.0275
Contingency Coefficient 0.0275
Cramer's V 0.0275
WARNING:25% of the cells have expected counts less
than 5.Chi-Square may not be a valid test.
Fisher's Exact Test
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Cell (1,1) Frequency (F) 15
Left-sided Pr = F 0.3696
Table Probability (P) 0.1962
Two-sided Pr
能否再讲一下理论频数，小于5.浅显一点，