detectbound: Detect bounds for density function

In fitdistrplus: Help to Fit of a Parametric Distribution to Non-Censored or Censored Data

Detect bounds for density function

Description

Manual detection of bounds of parameter of a density function/

Usage

detectbound(distname, vstart, obs, fix.arg=NULL, echo=FALSE)

Arguments

distname	A character string "name" naming a distribution for which the corresponding density function dname must be classically defined.
vstart	A named vector giving the initial values of parameters of the named distribution.
obs	A numeric vector for non censored data.
fix.arg	An optional named vector giving the values of fixed parameters of the named distribution. Default to NULL.
echo	A logical to show some traces.

Details

This function manually tests the following bounds : -1, 0, and 1.

Value

detectbound returns a 2-row matrix with the lower bounds in the first row and the upper bounds in the second row.

Author(s)

Christophe Dutang and Marie-Laure Delignette-Muller.

References

Delignette-Muller ML and Dutang C (2015), fitdistrplus: An R Package for Fitting Distributions. Journal of Statistical Software, 64(4), 1-34, \Sexpr[results=rd]{tools:::Rd_expr_doi("https://doi.org/10.18637/jss.v064.i04")}.

See Also

fitdist.

Examples

# case where the density returns a Not-an-Numeric value.
detectbound("exp", c(rate=3), 1:10)
detectbound("binom", c(size=3, prob=1/2), 1:10)
detectbound("nbinom", c(size=3, prob=1/2), 1:10)

fitdistrplus documentation built on Sept. 11, 2024, 7:08 p.m.