Exponential {base}

R Documentation

The Exponential Distribution

Usage

dexp(x, rate = 1)
pexp(q, rate = 1)
qexp(p, rate = 1)
rexp(n, rate = 1)

Arguments

x q	vector of quantiles
p	vector of probabilities
n	number of observations to generate
rate	vector of rates

Value

These functions provide information about the exponential distribution with rate rate (i.e., mean 1/rate). dexp gives the density, pexp gives the distribution function, qexp gives the quantile function and rexp generates random deviates.

The exponential distribution with rate \lambda has density

f(x) = \lambda {e}^{- \lambda x}

for x \ge 0.

See Also

exp, dchisq for the chisquare and dweibull for the Weibull distribution which both generalize the exponential.

Examples

dexp(1) - exp(-1) #-> 0
r <- rexp(100)
all(abs(1 - dexp(1, r) / (r*exp(-r))) < 1e-14)

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