Logis-class

0th

Percentile

Class "Logis"

The Logistic distribution with location $= m$, by default = 0, and scale $= s$, by default = 1, has distribution function $$ p(x) = \frac{1}{1 + e^{-(x-\mu)/\sigma}}% $$ and density $$ d(x)= \frac{1}{\sigma}\frac{e^{(x-\mu)/\sigma}}{(1 + e^{(x-\mu)/\sigma})^2}% $$

It is a long-tailed distribution with mean $m$ and variance $pi^2 /3 s^2$. C.f. rlogis

Keywords
distribution
Objects from the Class

Objects can be created by calls of the form Logis(location, scale). This object is a logistic distribution.

Slots

img
Object of class "Reals": The space of the image of this distribution has got dimension 1 and the name "Real Space".
param
Object of class "LogisParameter": the parameter of this distribution (location and scale), declared at its instantiation
r
Object of class "function": generates random numbers (calls function rlogis)
d
Object of class "function": density function (calls function dlogis)
p
Object of class "function": cumulative function (calls function plogis)
q
Object of class "function": inverse of the cumulative function (calls function qlogis)
.withArith
logical: used internally to issue warnings as to interpretation of arithmetics
.withSim
logical: used internally to issue warnings as to accuracy
.logExact
logical: used internally to flag the case where there are explicit formulae for the log version of density, cdf, and quantile function
.lowerExact
logical: used internally to flag the case where there are explicit formulae for the lower tail version of cdf and quantile function
Symmetry
object of class "DistributionSymmetry"; used internally to avoid unnecessary calculations.

Extends

Class "AbscontDistribution", directly. Class "UnivariateDistribution", by class "AbscontDistribution". Class "Distribution", by class "AbscontDistribution".

Methods

initialize
signature(.Object = "Logis"): initialize method
location
signature(object = "Logis"): returns the slot location of the parameter of the distribution
location<-
signature(object = "Logis"): modifies the slot location of the parameter of the distribution
scale
signature(object = "Logis"): returns the slot scale of the parameter of the distribution
scale<-
signature(object = "Logis"): modifies the slot scale of the parameter of the distribution
*
signature(e1 = "Logis", e2 = "numeric")
+
signature(e1 = "Logis", e2 = "numeric"): For the logistic location scale family we use its closedness under affine linear transformations.

See Also

LogisParameter-class AbscontDistribution-class Reals-class rlogis

Aliases
  • Logis-class
  • Logis
  • initialize,Logis-method
Examples
L <- Logis(location = 1,scale = 1)
# L is a logistic distribution with  location = 1 and scale = 1.
r(L)(1) # one random number generated from this distribution, e.g. 5.87557
d(L)(1) # Density of this distribution is 0.25 for x = 1.
p(L)(1) # Probability that x < 1 is 0.5.
q(L)(.1) # Probability that x < -1.197225 is 0.1.
location(L) # location of this distribution is 1.
location(L) <- 2 # location of this distribution is now 2.
Documentation reproduced from package distr, version 2.6, License: LGPL-3

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