Description Usage Arguments Details Value Note Author(s) References

A function to calculate numerical derivatives.

1 2 | ```
numeric.deriv(expr, theta, delta = NULL,
rho = sys.frame(sys.parent()))
``` |

`expr` |
The expression to be differentiated |

`theta` |
A character vector |

`delta` |
constant for the accuracy |

`rho` |
environment |

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`

.

A vector of numerical derivatives

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

Mikis Stasinopoulos

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/).

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