LNORM3: Three-Parameter Lognormal Distribution

Description Usage Arguments Details Value See Also Examples

Description

Density, distribution function, quantile function and random generation for the 3-parameter lognormal distribution with shape, scale, and threshold (or shift) parameters equal to shape, scale, and thres, respectively.

Usage

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dlnorm3(x,shape=1,scale=1,thres=0,log=FALSE)
plnorm3(q,shape=1,scale=1,thres=0,lower.tail=TRUE,log.p=FALSE)
qlnorm3(p,shape=1,scale=1,thres=0,lower.tail=TRUE,log.p=FALSE)
rlnorm3(n,shape=1,scale=1,thres=0)

Arguments

x,q

vector of quantiles.

p

vector of probabilities.

n

number of observations.

shape

shape parameter.

scale

scale parameter.

thres

threshold (or shift) parameter.

log,log.p

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

lower.tail

logical; if TRUE (default), probabilities are P[X <= x],otherwise, P[X > x].

Details

If Y is a random variable distributed according to a normal distribution (with location(mean) and scale(standard deviation) parameters), then X = exp(Y)+m has a 3-parameter lognormal distribution with shape and scale parameters corresponding to the scale and location parameteres of Y, respectively; and threshold parameter m.

Value

dlnorm3 gives the density, plnorm3 gives the distribution function, qlnorm3 gives the quantile function, and rlnorm3 generates random deviates.

See Also

dnorm, pnorm, qnorm, rnorm, dlnorm, plnorm, qlnorm, rlnorm

Examples

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m <- 100
x <- rlnorm3(10,1,0,m)
dlnorm3(x,1,0,m)
dlnorm(x-m,0,1)
dnorm(log(x-m),0,1)/(x-m)

Example output

 [1] 0.4845318 0.6322110 0.6180881 0.2435706 0.6035988 0.6114316 0.3524868
 [8] 0.5289494 0.6025743 0.1423993
 [1] 0.4845318 0.6322110 0.6180881 0.2435706 0.6035988 0.6114316 0.3524868
 [8] 0.5289494 0.6025743 0.1423993
 [1] 0.4845318 0.6322110 0.6180881 0.2435706 0.6035988 0.6114316 0.3524868
 [8] 0.5289494 0.6025743 0.1423993

FAdist documentation built on April 17, 2020, 1:24 a.m.