Fisher Exact Test Calculator

Calculate Fisher exact test for 2x2 contingency tables.

Cell a (R1,C1)

Cell b (R1,C2)

Cell c (R2,C1)

Cell d (R2,C2)

Odds Ratio

9.3333

Total N20

Row 1 Total10

Row 2 Total10

Odds Ratio vs Cell a (R1,C1)

Formule

## Fisher Exact Test Computes exact probability for 2x2 tables. Preferred over chi-square for small samples.

2x2: a=8, b=2, c=3, d=7.

When vs chi-square?

When any expected count < 5 or N < 20.

Odds ratio?

OR > 1 means event more likely in group 1.

Beyond 2x2?

Use Freeman-Halton extension.

Apprendre

Goodness of fit.

Non-parametric test.

Test proportion.