gfun {ordinal}R Documentation

Gradients of common densities

Description

Gradients of common density functions in their standard forms, i.e., with zero location (mean) and unit scale. These are implemented in C for speed and care is taken that the correct results are provided for the argument being NA, NaN, Inf, -Inf or just extremely small or large.

Usage


gnorm(x)

glogis(x)

gcauchy(x)

Arguments

x

numeric vector of quantiles.

Details

The gradients are given by:

These gradients are used in the Newton-Raphson algorithms in fitting cumulative link models with clm and cumulative link mixed models with clmm.

Value

a numeric vector of gradients.

Author(s)

Rune Haubo B Christensen

See Also

Gradients of densities are also implemented for the extreme value distribtion (gumbel) and the the log-gamma distribution (log-gamma).

Examples


x <- -5:5
gnorm(x)
glogis(x)
gcauchy(x)


[Package ordinal version 2023.12-4 Index]