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PROBF

PROBF

Returns the probability from an F distribution

Category: Probability
See: CDF

Syntax
Arguments
Details
Examples

Syntax

PROBF(x,ndf,ddf<,nc>)

Arguments

x
is a numeric random variable.
Range: x [ge] 0

ndf
is a numeric numerator degrees of freedom parameter.
Range: ndf > 0

ddf
is a numeric denominator degrees of freedom parameter.
Range: ddf > 0

nc
is an optional numeric noncentrality parameter.
Range: nc [ge] 0

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 


p=1-probf(x,ndf,ddf);

Examples

SAS Statements Results 

x=probf(3.32,2,3);
 0.8263933602


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