Example: Fisher's Exact Test
Fisher's exact test is exact because the sampling distribution (conditional on the marginals) is known exactly. Compare Pearson's chi-squared test, which (although it tests the same null) is not exact because the distribution of the test statistic is correct only asymptotically.
Read more about this topic: Exact Test
Famous quotes containing the words fisher, exact and/or test:
“Our family talked a lot at table, and only two subjects were taboo: politics and personal troubles. The first was sternly avoided because Father ran a nonpartisan daily in a small town, with some success, and did not wish to express his own opinions in public, even when in private.”
—M.F.K. Fisher (1908–1992)
“The secret of genius is to suffer no fiction to exist for us; to realize all that we know; in the high refinement of modern life, in arts, in sciences, in books, in men, to exact good faith, reality, and a purpose; and first, last, midst, and without end, to honor every truth by use.”
—Ralph Waldo Emerson (1803–1882)
“The face we see was never young,
Nor could it ever have been old.
For he, to whom we had applied
Our shopman’s test of age and worth,
Was elemental when he died,
As he was ancient at his birth:”
—Edwin Arlington Robinson (1869–1935)