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The closeness of a match is measured in terms of the number of primitive operations necessary to convert the string into an exact match. This number is called the edit distance between the string and the pattern. The usual primitive operations are: [1] insertion: cot → coat; deletion: coat → cot; substitution: coat → cost
An alternative exact test, Barnard's exact test, has been developed and proponents [22] of it suggest that this method is more powerful, particularly in 2×2 tables. [23] Furthermore, Boschloo's test is an exact test that is uniformly more powerful than Fisher's exact test by construction. [24]