snbinom: Internal function: first derivatives of NB2 PMF

In WALS: Weighted-Average Least Squares Model Averaging

Internal function: first derivatives of NB2 PMF

Description

First derivatives of NB2 PMF used in fitNB2. Code is taken from the function snbinom() in the countreg package version 0.2-1 (2023-06-13) \insertCitecountregWALS.

Usage

snbinom(x, mu, size, parameter = c("mu", "size"), drop = TRUE)

Arguments

x	Vector of quantiles.
mu	Vector of means.
size	Vector of dispersion parameter. If a scalar is given, the value is recycled.
parameter	Specifies which parameter the derivative is taken for. parameter = c("mu", "size") returns a matrix with derivatives for both parameters.
drop	If TRUE, drops empty dimensions of return using drop. If FALSE does not apply drop.

Value

A vector or matrix containing the first derivatives.

References

\insertAllCited

WALS documentation built on June 22, 2024, 9:42 a.m.