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CHIDIST
Returns the one-tailed probability of the chi-squared distribution. The γ2 distribution is associated with a γ2 test. Use the γ2 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 γ2 random variable.
Example
The example may be easier to understand if you copy it to a blank spreadsheet.
How?
- Create a blank spreadsheet.
- Select the example in the Help topic.
Selecting an example from Help
- Press CTRL+C.
- In the spreadsheet, select cell A1, and press CTRL+V.
- To switch between viewing the formula that returns the result and the result in the cell, select the cell and press F2 and then ENTER, or click Commands and Options on the spreadsheet toolbar, click the Formula tab, and look in the Formula in active cell (active cell) box.
| Data | Description |
|---|---|
| 18.307 | Value at which you want to evaluate the distribution |
| 10 | Degrees of freedom |
| Formula | Description (Result) |
| =CHIDIST(A2,A3) | One-tailed probability of the chi-squared distribution, for the above terms (0.050001) |