# R/util-transform.R In fitdistrplus: Help to Fit of a Parametric Distribution to Non-Censored or Censored Data

#### Defines functions iT1InfT1InfiT0InfT0InfiT01T01iTm10Tm10

```#############################################################################
#   Copyright (c) 2009 Marie Laure Delignette-Muller, Christophe Dutang
#
#   This program is free software; you can redistribute it and/or modify
#   the Free Software Foundation; either version 2 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, write to the
#   Free Software Foundation, Inc.,
#   59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
#
#############################################################################
### Infinitely differentiable transformations of R into a bounded or half-bounded interval
###
###         R functions
###

#inverse are useless?

#Transformation from (-Inf, +Inf) to (-1, 0)
Tm10 <- function(x)
-1/(1+exp(-x))
#Inverse
iTm10 <- function(x)
log(-x/(1+x))

#Transformation from (-Inf, +Inf) to (0, 1)
T01 <- function(x)
1/(1+exp(-x))
#Inverse
iT01 <- function(x)
log(x/(1-x))

#Transformation from (-Inf, +Inf) to (0, +Inf)
T0Inf <- function(x)
exp(x)
#Inverse
iT0Inf <- function(x)
log(x)

#Transformation from (-Inf, +Inf) to (1, +Inf)
T1Inf <- function(x)
1+exp(x)
#Inverse
iT1Inf <- function(x)
log(x-1)
```

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fitdistrplus documentation built on April 25, 2023, 5:09 p.m.