PROBF Function

Returns the probability from an F distribution.

Category: Probability
Returned data type: DOUBLE
Syntax
Arguments
Details
Example

Syntax

PROBF(x, ndf, ddf[, nc])

Arguments

x

is a numeric random variable.

Range x ≥ 0
Data type DOUBLE

ndf

is a numeric numerator degrees of freedom parameter.

Range ndf > 0
Data type DOUBLE

ddf

is a numeric denominator degrees of freedom parameter.

Range ddf > 0
Data type DOUBLE

nc

is an optional numeric noncentrality parameter.

Range nc ≥ 0
Data type DOUBLE

Details

The PROBF function returns the probability that an observation from an F distribution, with numerator degrees of freedom ndf, denominator degrees of freedom ddf, and noncentrality parameter nc, is less than or equal to x. The PROBF function accepts noninteger degrees of freedom parameters ndf and ddf. If the optional parameter nc is not specified or has the value 0, the value returned is from the central F distribution.
The significance level for an F test statistic is given by the following equation.
p=1-probf(x,ndf,ddf);

Example

The following statement illustrates the PROBF function:
Statements
Results
 
select probf(3.32,2,3);
 
0.8263933602
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Last updated: February 23, 2017