Fisher's Exact Test Calculator

Cell a (Row 1, Col 1)

Cell b (Row 1, Col 2)

Cell c (Row 2, Col 1)

Cell d (Row 2, Col 2)

Formula

p = (R1! R2! C1! C2!) / (N! a! b! c! d!)

What is Fisher's exact test?

An exact test for association in 2x2 tables, useful with small sample sizes where chi-square may be unreliable.

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