P_{A} =  the probability of the observed array of cell frequencies plus the sum of the probabilities of all other cellfrequency arrays (such as would be consistent with the observed marginal totals) that are equal to or smaller than the probability of the observed array. 

P_{B} =  the probability of the observed array of cell frequencies plus the sum of the probabilities of all other cellfrequency arrays (such as would be consistent with the observed marginal totals) that are smaller than the probability of the observed array. 

Note that P_{A} and P_{B} are both nondirectional (twotailed) probabilities. 
C_{1}  C_{2}  C_{3}  C_{4}  Totals 
The Fisher test is performed only if N≤120. Note that P_{A} and P_{B} are both nondirectional (twotailed). The chisquare test is performed only if at least 80% of the cells have an expected frequency of 5 or greater, and no cell has an expected frequency smaller than 1.0. 

R_{1}  
R_{2}  
Totals  
Fisher Exact Probability Test 

Probability per Definition A: P_{A} = Probability per Definition B: P_{B} = No. of tables evaluated = 

ChiSquare Test (df=3) 

Chisquare = P = 

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