weibull.rm {weibullness}

Robust estimate of shape and scale parameters of Weibull using the repeated median method

Description

Calculates the estimates of the shape and scale parameters.

Usage

weibull.rm(x, a)

Arguments

x

a numeric vector of observations.

a

the offset fraction to be used; typically in (0,1). See ppoints.

Details

weibull.rm obtains the robust estimates of the shape and scale parameters using the intercept and slope estimates using the repeated median method from the Weibull plot.

Value

An object of class "weibull.estimate", a list with two parameter estimates

Author(s)

Chanseok Park

References

Siegel, A. F. (1982). Robust Regression Using Repeated Medians. Biometrika, 69, 242-244.

See Also

weibull.mle for the parameter estimation using the maximum likelihood method.

weibull.wp for the parameter estimation using the Weibull plot.

fitdistr for maximum-likelihood fitting of univariate distributions in package MASS.

Examples

data = c(355,725,884,462,1092,190,166,172,188,224,267,298,355,471,
        154,101,76,811,80,249,752,305,301,386,667,212,186,127,
        121,214,242,237,355,210,253,400,401,514,211,285)
weibull.rm(data)