EMWEx | R Documentation |
The Exponentiated Modifien Weibull Extension family
EMWEx(mu.link = "log", sigma.link = "log", nu.link = "log", tau.link = "log")
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 parameter. |
tau.link |
defines the tau.link, with "log" link as the default for the tau parameter. |
The Beta-Weibull distribution with parameters mu
,
sigma
, nu
and tau
has density given by
f(x)= ν σ τ (\frac{x}{μ})^{σ-1} \exp((\frac{x}{μ})^σ + ν μ (1- \exp((\frac{x}{μ})^σ))) (1 - \exp (νμ (1- \exp((\frac{x}{μ})^σ))))^{τ-1} ,
for x > 0, ν> 0, μ > 0, σ> 0 and τ > 0.
Returns a gamlss.family object which can be used to fit a EMWEx distribution in the gamlss()
function.
Johan David Marin Benjumea, johand.marin@udea.edu.co
almalki2014modificationsRelDists
\insertRefsarhan2013exponentiatedRelDists
dEMWEx
# Example 1 # Generating some random values with # known mu, sigma, nu and tau y <- rEMWEx(n=100, mu = 1, sigma =1.21, nu=1, tau=2) # Fitting the model require(gamlss) mod <- gamlss(y~1, sigma.fo=~1, nu.fo=~1, tau.fo=~1, family=EMWEx, control=gamlss.control(n.cyc=5000, trace=FALSE)) # Extracting the fitted values for mu, sigma, nu and tau # using the inverse link function exp(coef(mod, what='mu')) exp(coef(mod, what='sigma')) exp(coef(mod, what='nu')) exp(coef(mod, what='tau')) # Example 2 # Generating random values under some model n <- 200 x1 <- runif(n, min=0.4, max=0.6) x2 <- runif(n, min=0.4, max=0.6) mu <- exp(0.75 - x1) sigma <- exp(0.5 - x2) nu <- 1 tau <- 2 x <- rEMWEx(n=n, mu, sigma, nu, tau) mod <- gamlss(x~x1, sigma.fo=~x2, nu.fo=~1, tau.fo=~1, family=EMWEx, control=gamlss.control(n.cyc=5000, trace=FALSE)) coef(mod, what="mu") coef(mod, what="sigma") exp(coef(mod, what="nu")) exp(coef(mod, what="tau"))
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