FDIST Function

Basic Description

The Excel FDIST function calculates the (right-tailed) F Probability Distribution, which measures the degree of diversity between two data sets.

Syntax: FDIST( x, deg_freedom1, deg_freedom2 )

Where the function arguments are:

x The (positive) numeric value at which the function is to be evaluated
deg_freedom1 An integer specifying the numerator degrees of freedom
deg_freedom2 An integer specifying the denominator degrees of freedom


If either deg_freedom1 or deg_freedom2 are decimal numbers, these are truncated to integers by Excel.

Plot of the F Probability Distribution with numerator degrees of freedom = 1 and denominator degrees of freedom = 2

F Prob. Distribution with deg_freedom1 = 1 & deg_freedom2 = 2

Fdist Function Example

The chart on the right shows the right-tailed F Probability Distribution with the numerator degrees of freedom equal to 1 and the denominator degrees of freedom equal to 2. If you want to use Excel to calculate the value of this function at x = 5, this can be done by the Fdist function, as follows:

=FDIST( 5, 1, 2 )

This gives the result 0.154845745.


Fdist Function Common Errors

If you get an error from the Excel Fdist function this is likely to be one of the following :

#NUM! Occurs if either the supplied x value is < 0 or the supplied deg_freedom1 or the deg_freedom2 argument is < 1 or ≥ 10^10
#VALUE! Occurs if any of the supplied arguments are non-numeric

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