gamlss (version 5.1-4)

numeric.deriv: 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

Value

A vector of numerical derivatives

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.

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.

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, http://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 http://www.gamlss.org/).