# binreg package for R (http://www.R-project.org)
# Copyright (C) 2013 Bernardo dos Santos, Adriano Polpo,
# Carlos A. de B. Pereira.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Aranda density function
daranda <- function(x, alpha = 1) {
if(length(alpha) != 1)
stop("alpha = ", deparse(substitute(alpha)), " should have exactly one element.")
return( ifelse(alpha*exp(x) > -1, exp(x)*(alpha*exp(x) + 1)^(-1/alpha - 1), 0) )
}
# Aranda distribution function
paranda <- function(q, alpha = 1) {
if(length(alpha) != 1)
stop("alpha = ", deparse(substitute(alpha)), " should have exactly one element.")
return( ifelse(alpha*exp(q) > -1, 1 - (alpha*exp(q) + 1)^(-1/alpha), 1) )
}
# Aranda quantile function
qaranda <- function(p, alpha = 1) {
if(length(alpha) != 1)
stop("alpha = ", deparse(substitute(alpha)), " should have exactly one element.")
return( log(((1-p)^(-alpha)-1)/alpha) )
}
# random generate from Aranda distribution
raranda <- function(n, alpha = 1) {
if(length(alpha) != 1)
stop("alpha = ", deparse(substitute(alpha)), " should have exactly one element.")
return(qaranda(runif(n),alpha))
}
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