| Poisson {base} | R Documentation |
The Poisson Distribution
Description
These functions provide information about the Poisson distribution
with parameter lambda. dpois gives the density,
ppois gives the distribution function qpois gives the
quantile function and rpois generates random deviates.
The Poisson distribution has density
p(x) = \frac{{\lambda}^{x} {e}^{-\lambda}}{x!}
for x = 0, 1, 2, \ldots.
Usage
dpois(x, lambda)
ppois(q, lambda)
qpois(p, lambda)
rpois(n, lambda)
Arguments
x |
vector of (positive) quantiles. |
p |
vector of probabilities. |
n |
number of random values to return. |
lambda |
vector of positive means. |
Examples
-log(dpois(0:7, lambda=1) * gamma(1+ 0:7))
Ni <- rpois(50, lam= 4); table(factor(Ni, 0:max(Ni)))