OW: The Odd Weibull family

In ousuga/RelDists: Estimation for some Reliability Distributions

The Odd Weibull family

Description

The function OW() defines the Odd Weibull distribution, a three parameter distribution, for a gamlss.family object to be used in GAMLSS fitting using the function gamlss().

Usage

OW(mu.link = "log", sigma.link = "log", nu.link = "log")

Arguments

mu.link	defines the mu.link, with "log" link as the default for the mu parameter.
sigma.link	defines the sigma.link, with "log" link as the default for the sigma.
nu.link	defines the nu.link, with "log" link as the default for the nu.

Details

The odd Weibull with parameters mu, sigma and nu has density given by

f(t) = \left( \frac{\sigma\nu}{t} \right) (\mu t)^\sigma e^{(\mu t)^\sigma} \left(e^{(\mu t)^{\sigma}}-1\right)^{\nu-1} \left[ 1 + \left(e^{(\mu t)^{\sigma}}-1\right)^\nu \right]^{-2}

for x > 0.

Value

Returns a gamlss.family object which can be used to fit a OW distribution in the gamlss() function.

Author(s)

Jaime Mosquera Gutiérrez [e-mail]

References

\insertRef

Cooray2006RelDists

Examples

# Example 1
# Generating some random values with
# known mu, sigma and nu
y <- rOW(n=200, mu=0.1, sigma=7, nu = 1.1)

# Fitting the model
require(gamlss)
mod <- gamlss(y~1, sigma.fo=~1, nu.fo=~1, family="OW",
              control=gamlss.control(n.cyc=500, trace=FALSE))

# Extracting the fitted values for mu, sigma and nu
# using the inverse link function
exp(coef(mod, what='mu'))
exp(coef(mod, what='sigma'))
exp(coef(mod, what='nu'))

# Example 2
# Generating random values under some model
n <- 500
x1 <- runif(n)
x2 <- runif(n)
x3 <- runif(n)
mu <- exp(1.2 + 2 * x1)
sigma <- 2.12 + 3 * x2
nu <- exp(0.2 - x3)
x <- rOW(n=n, mu, sigma, nu)

mod <- gamlss(x~x1, sigma.fo=~x2, nu.fo=~x3, 
              family=OW(sigma.link='identity'), 
              control=gamlss.control(n.cyc=300, trace=FALSE))

coef(mod, what='mu')
coef(mod, what='sigma')
coef(mod, what='nu')

ousuga/RelDists documentation built on July 10, 2024, 12:48 p.m.