Noncentral *F* probability density
function

`Y = ncfpdf(X,NU1,NU2,DELTA)`

`Y = ncfpdf(X,NU1,NU2,DELTA)`

computes
the noncentral *F* pdf at each of the values in `X`

using
the corresponding numerator degrees of freedom in `NU1`

,
denominator degrees of freedom in `NU2`

, and positive
noncentrality parameters in `DELTA`

. `X`

, `NU1`

, `N2`

,
and `B`

can be vectors, matrices, or multidimensional
arrays that all have the same size, which is also the size of `Y`

.
A scalar input for `P`

, `NU1`

, `NU2`

,
or `DELTA`

is expanded to a constant array with the
same dimensions as the other inputs.

The *F* distribution is a special case of
the noncentral *F* where δ = 0. As δ increases, the distribution flattens like
the plot in the example.

[1] Johnson, N., and S. Kotz. *Distributions
in Statistics: Continuous Univariate Distributions-2.* Hoboken,
NJ: John Wiley & Sons, Inc., 1970, pp. 189–200.

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