R: An internal GAMLSS function for numerical derivatives

numeric.deriv {gamlss} | R Documentation

## An internal GAMLSS function for numerical derivatives

### Description

A function to calculate numerical derivatives.

### Usage

    numeric.deriv(expr, theta, delta = NULL,
                  rho = sys.frame(sys.parent()))

### Arguments

`expr` | The expression to be differentiated
`theta` | A character vector
`delta` | constant for the accuracy
`rho` | environment

### Details

This function is use by several GAMLSS functions but it is not for general use since there are more reliable function to do that in `R`.

### Value

A vector of numerical derivatives

### Note

Do not use this function unless you know what you are doing

### Author(s)

Mikis Stasinopoulos

### References

Rigby, R. A. and Stasinopoulos D. M. (2005). Generalized additive models for location, scale and shape,(with discussion), Appl. Statist., 54, part 3, pp 507-554.

Rigby, R. A., Stasinopoulos, D. M., Heller, G. Z., and De Bastiani, F. (2019) Distributions for modeling location, scale, and shape: Using GAMLSS in R, Chapman and Hall/CRC. An older version can be found in https://www.gamlss.com/.

Stasinopoulos D. M. Rigby R.A. (2007) Generalized additive models for location scale and shape (GAMLSS) in R. Journal of Statistical Software, Vol. 23, Issue 7, Dec 2007, https://www.jstatsoft.org/v23/i07/.

Stasinopoulos D. M., Rigby R.A., Heller G., Voudouris V., and De Bastiani F., (2017) Flexible Regression and Smoothing: Using GAMLSS in R, Chapman and Hall/CRC.

(see also https://www.gamlss.com/).

[Package gamlss version 5.3-2 Index]