# How do I enable statistical tests in cross tables?

Superdig has included significance testing as basic functionality. By this you will be able to see which categories differ from total (Chi-2) or from each other (t-test) in a simple way.

By default all tables are having Chi2 (“Chi-square”)-significance testing included. You may modify or turn these off, either by selecting the table(s) or changing default values

To specify significance testing:

- Specify whether you want to run Chi-2 testing, t-testing or both
- Specify at which level you want to run the tests at.
- For Chi2-tests, the following apply:
- 0 (Zero) the test level is determined by the table filter number of cases as follows: 10% when cases = 1-300, 5% (95% confidence inetrval) when cases = 301-1000, 2,5% when cases = 1001-4000, 0,5% when cases = 4001-20000 0,1% when cases = 20001 or more
- By specifying a number “N”, the test level will override the automatic level. The value is restricted to values ranging between 0 and 50.
- The results of the significance test will be visualized as colored cells in the table
- Green cells respectively red cells indicating a significantly higher (lower) level than the “Total” column
- The level at which the table has been run will be shown in the documentation cell in the upper left corner of the table

- For t-tests, the following apply
- 0 (Zero) the test level is determined by the table filter number of cases as follows: 10% (90% confidence interval) when cases = 1-200, 5% when cases = 201-400, 2% when cases = 401-800, 1% when cases = 801-1600, 0,5% when cases = 1601-3200, 0,2% when cases = 3201-6400, 0,1% when cases = 6401 or more
- By specifying a number “N”, the test level will override the automatic level. The value is restricted to values ranging between 0 and 50.
- The results of the significance test will be visualized as follows:
- A column-naming shown at the top of each column (“Column symbols for T-test”) This will be a letter from a-z
- A documentation which columns that are tested towards each other (a?b means that column a has been tested towards column b)
- A greater than / less than sign specifying in which the cell significantly higher / lower is (If a table cell in column "a" says “>b” means that the figure in column a is greater than the corresponding figure in column b)

Example showing Chi2 test at 5%

Example showing T-test at 5%