Exact analysis of large contingency tables is uncommon: it
is mostly used to solve the problem of
sparsely populated
tables. If your table's cells are all larger than 4,
*X*^{2}
is probably what you want!

For exact analysis of 2x2 tables you may prefer the following (faster) "one-sided" analysis.

Number of rows:

Number of columns:

You must have data for each box in the table: no blanks allowed!