Bernoulli Distribution

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Description

These functions provide the density, distribution function, quantile function, and random generation for the Bernoulli distribution.

Usage

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dbern(x, prob, log=FALSE)
pbern(q, prob, lower.tail=TRUE, log.p=FALSE)
qbern(p, prob, lower.tail=TRUE, log.p=FALSE)
rbern(n, prob)

Arguments

x, q

These are each a vector of quantiles.

p

This is a vector of probabilities.

n

This is the number of observations. If length(n) > 1, then the length is taken to be the number required.

prob

This is the probability of success on each trial.

log, log.p

Logical. if TRUE, probabilities p are given as log(p).

lower.tail

Logical. if TRUE (default), probabilities are Pr[X <= x], otherwise, Pr[X > x].

Details

  • Application: Continuous Univariate

  • Density: p(theta) = p^theta (1-p)^(1-theta), theta = 0,1

  • Inventor: Jacob Bernoulli

  • Notation 1: theta ~ Bern(p)

  • Notation 2: p(theta) = Bern(theta | p)

  • Parameter 1: probability parameter 0 <= p <= 1

  • Mean: E(theta) = p

  • Variance: var(theta) = p / (1-p)

  • Mode: mode(theta) =

The Bernoulli distribution is a binomial distribution with n=1, and one instance of a Bernoulli distribution is called a Bernoulli trial. One coin flip is a Bernoulli trial, for example. The categorical distribution is the generalization of the Bernoulli distribution for variables with more than two discrete values. The beta distribution is the conjugate prior distribution of the Bernoulli distribution. The geometric distribution is the number of Bernoulli trials needed to get one success.

Value

dbern gives the density, pbern gives the distribution function, qbern gives the quantile function, and rbern generates random deviates.

See Also

dbinom

Examples

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library(LaplacesDemon)
dbern(1, 0.7)
rbern(10, 0.5)

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