@stdlib/stats
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Standard library statistical functions.
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{{alias}}( x, d1, d2 )
Evaluates the probability density function (PDF) for an F distribution with
numerator degrees of freedom `d1` and denominator degrees of freedom `d2` at
a value `x`.
If provided `NaN` as any argument, the function returns `NaN`.
If provided `d1 <= 0` or `d2 <= 0`, the function returns `NaN`.
Parameters
----------
x: number
Input value.
d1: number
Numerator degrees of freedom.
d2: number
Denominator degrees of freedom.
Returns
-------
out: number
Evaluated PDF.
Examples
--------
> var y = {{alias}}( 2.0, 0.5, 1.0 )
~0.057
> y = {{alias}}( 0.1, 1.0, 1.0 )
~0.915
> y = {{alias}}( -1.0, 4.0, 2.0 )
0.0
> y = {{alias}}( NaN, 1.0, 1.0 )
NaN
> y = {{alias}}( 0.0, NaN, 1.0 )
NaN
> y = {{alias}}( 0.0, 1.0, NaN )
NaN
> y = {{alias}}( 2.0, 1.0, -1.0 )
NaN
> y = {{alias}}( 2.0, -1.0, 1.0 )
NaN
{{alias}}.factory( d1, d2 )
Returns a function for evaluating the probability density function (PDF) of
an F distribution with numerator degrees of freedom `d1` and denominator
degrees of freedom `d2`.
Parameters
----------
d1: number
Numerator degrees of freedom.
d2: number
Denominator degrees of freedom.
Returns
-------
pdf: Function
Probability density function (PDF).
Examples
--------
> var myPDF = {{alias}}.factory( 6.0, 7.0 );
> var y = myPDF( 7.0 )
~0.004
> y = myPDF( 2.0 )
~0.166
See Also
--------