﻿ CHIDIST function

CHIDIST function

Returns the right-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.

Important   This function has been replaced with one or more new functions that may provide improved accuracy and whose names better reflect their usage. This function is still available for compatibility with earlier versions of Excel. However, if backward compatibility is not required, you should consider using the new functions from now on, because they more accurately describe their functionality.

Syntax

CHIDIST(x,deg_freedom)

The CHIDIST function syntax has the following arguments:

• X     Required. The value at which you want to evaluate the distribution.

• Deg_freedom     Required. 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 deg_freedom is not an integer, it is truncated.

• If deg_freedom < 1 or deg_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 do I copy an example?

Important   Do not select the row or column headers.

Selecting an example from Help

2. Press CTRL+C.

3. In Excel, create a blank workbook or worksheet.

4. In the worksheet, select cell A1, and press CTRL+V.

Important   For the example to work properly, you must paste it into cell A1 of the worksheet.

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.

After you copy the example to a blank worksheet, you can adapt it to suit your needs.

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 A B 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)

Applies To: Excel 2010, Excel Starter, Excel Online, SharePoint Online

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