CHIDIST

Returns the one-tailed probability of the chi-squared distribution. The χ² distribution is associated with a χ² test. Use the χ² test to compare observed and expected values. For example, a genetic experiment might hypothesize that the next generation of plants will exhibit a certain set of colors. By comparing the observed results with the expected ones, you can decide whether your original hypothesis is valid.

Syntax

CHIDIST(x,degrees_freedom)

X is the value at which you want to evaluate the distribution.

Degrees_freedom is the number of degrees of freedom.

Remarks

• If either argument is nonnumeric, CHIDIST returns the #VALUE! error value.
• If x is negative, CHIDIST returns the #NUM! error value.
• If degrees_freedom is not an integer, it is truncated.
• If degrees_freedom < 1 or degrees_freedom > 10^10, CHIDIST returns the #NUM! error value.
• CHIDIST is calculated as CHIDIST = P(X>x), where X is a χ² random variable.

Example

The example may be easier to understand if you copy it to a blank worksheet.

How to copy an example

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

   Note Do not select the row or column headers.

   Selecting an example from Help

3. Press CTRL+C.
4. In the worksheet, select cell A1, and press CTRL+V.
5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

See also:

• CHIINV
• CHITEST
• Statistical functions