Binom-class

0th

Percentile

Class "Binom"

The binomial distribution with size $= n$, by default $=1$, and prob $= p$, by default $=0.5$, has density $$p(x) = {n \choose x} {p}^{x} {(1-p)}^{n-x}$$ for $x = 0, \ldots, n$.

C.f.rbinom

Keywords
distribution
Objects from the Class

Objects can be created by calls of the form Binom(prob, size). This object is a binomial 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 "BinomParameter": the parameter of this distribution (prob, size), declared at its instantiation
r
Object of class "function": generates random numbers (calls function rbinom)
d
Object of class "function": density function (calls function dbinom)
p
Object of class "function": cumulative function (calls function pbinom)
q
Object of class "function": inverse of the cumulative function (calls function qbinom). The quantile is defined as the smallest value x such that F(x) >= p, where F is the cumulative 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 "UnivariateDistribution", by class "DiscreteDistribution". Class "Distribution", by class "DiscreteDistribution".

Methods

+
signature(e1 = "Binom", e2 = "Binom"): For two binomial distributions with equal probabilities the exact convolution formula is implemented thereby improving the general numerical accuracy.
initialize
signature(.Object = "Binom"): initialize method
prob
signature(object = "Binom"): returns the slot prob of the parameter of the distribution
prob<-
signature(object = "Binom"): modifies the slot prob of the parameter of the distribution
size
signature(object = "Binom"): returns the slot size of the parameter of the distribution
size<-
signature(object = "Binom"): modifies the slot size of the parameter of the distribution

See Also

BinomParameter-class DiscreteDistribution-class Naturals-class rbinom

Aliases
  • Binom-class
  • Binom
  • initialize,Binom-method
Examples
B <- Binom(prob=0.5,size=1) # B is a binomial distribution with prob=0.5 and size=1.
r(B)(1) # # one random number generated from this distribution, e.g. 1
d(B)(1) # Density of this distribution is  0.5 for x=1.
p(B)(0.4) # Probability that x<0.4 is 0.5.
q(B)(.1) # x=0 is the smallest value x such that p(B)(x)>=0.1.
size(B) # size of this distribution is 1.
size(B) <- 2 # size of this distribution is now 2.
C <- Binom(prob = 0.5, size = 1) # C is a binomial distribution with prob=0.5 and size=1.
D <- Binom(prob = 0.6, size = 1) # D is a binomial distribution with prob=0.6 and size=1.
E <- B + C # E is a binomial distribution with prob=0.5 and size=3.
F <- B + D # F is an object of class LatticeDistribution.
G <- B + as(D,"DiscreteDistribution") ## DiscreteDistribution
Documentation reproduced from package distr, version 2.6, License: LGPL-3

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