R Graphical Manual

Last data update: 2014.03.03

R: A Normal Distribution

normal

R Documentation

A Normal Distribution

Create an object representing a univariate normal distribution.

normal(expectation = 0, lambda, P = 1)

`expectation`	The expectation of the distribution.
`lambda`	THE NATURAL LOGARITHM OF THE STANDARD DEVIATION OF THE DISTRIBUTION. Thus, if the desired standard deviation is s, the second argument should be log(s). If the desired variance is v, the second argument should be log(v)/2. The default is a standard deviation of 1. An alternative to specifying this argument is to specify the precision parameter P.
`P`	If given, this argument specifies the precision of the distribution, i.e., the inverse of the variance.

A univariate normal probability distribution.

Petter Mostad <mostad@chalmers.se>

dist <- normal(3, log(0.7))
variance(dist)
dist <- normal(5, log(0.49)/2)
variance(dist)
dist <- normal(7, P = 2)
variance(dist)