Geom-class

0th

Percentile

Class "Geom"

The geometric distribution with prob $= p$ has density $$p(x) = p {(1-p)}^{x}$$ for $x = 0, 1, 2, ...$ C.f. rgeom

Keywords
distribution
Note

Working with a computer, we use a finite interval as support which carries at least mass 1-getdistrOption("TruncQuantile").

Objects from the Class

Objects can be created by calls of the form Geom(prob). This object is a geometric distribution.

Slots

img
Object of class "Naturals": The space of the image of this distribution has got dimension 1 and the name "Natural Space".
param
Object of class "NbinomParameter": the parameter of this distribution (prob), declared at its instantiation (size=1)
r
Object of class "function": generates random numbers (calls function rgeom)
d
Object of class "function": density function (calls function dgeom)
p
Object of class "function": cumulative function (calls function pgeom)
q
Object of class "function": inverse of the cumulative function (calls function qgeom). The quantile is defined as the smallest value $x$ such that $F(x) \ge p$, where $F$ is the distribution function.
support
Object of class "numeric": a (sorted) vector containing the support of the discrete density function
.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 "DiscreteDistribution", directly. Class "Nbinom", directly. Class "UnivariateDistribution", by class "DiscreteDistribution". Class "Distribution", by class "DiscreteDistribution".

Contains-Relations

By means of a contains argument in the class declaration, R ``knows'' that a distribution object obj of class "Geom" also is a negative Binomial distribution with parameters size = 1, prob = prob(obj)

Methods

initialize
signature(.Object = "Geom"): initialize method
prob
signature(object = "Geom"): returns the slot prob of the parameter of the distribution
prob<-
signature(object = "Geom"): modifies the slot prob of the parameter of the distribution

See Also

Nbinom-class GeomParameter-class DiscreteDistribution-class Naturals-class rgeom

Aliases
  • Geom-class
  • Geom
  • initialize,Geom-method
Examples
G <- Geom(prob = 0.5) # G is a geometric distribution with prob = 0.5.
r(G)(1) # one random number generated from this distribution, e.g. 0
d(G)(1) # Density of this distribution is 0.25 for x = 1.
p(G)(1) # Probability that x<1 is 0.75.
q(G)(.1) # x = 0 is the smallest value x such that p(G)(x) >= 0.1.
prob(G) # prob of this distribution is 0.5.
prob(G) <- 0.6 # prob of this distribution is now 0.6.
as(G,"Nbinom")
G+G+G
Documentation reproduced from package distr, version 2.6, License: LGPL-3

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