reliaR (version 0.01)

pp.weibull.ext: Probability versus Probability (PP) plot for the Weibull Extension(WE) distribution

Description

The function pp.weibull.ext() produces a PP plot for the Weibull Extension(WE) based on their MLE or any other estimate. Also, a reference line can be sketched.

Usage

pp.weibull.ext(x, alpha.est, beta.est, main = " ", line = FALSE, ...)

Arguments

x

vector of observations

alpha.est

estimate of the parameter alpha

beta.est

estimate of the parameter beta

main

the title for the plot.

line

logical; if TRUE, a 45 degree line is sketched.

...

additional arguments to be passed to the underlying plot function.

Value

The function pp.weibull.ext() carries out a PP plot for the Weibull Extension(WE).

References

Tang, Y., Xie, M. and Goh, T.N., (2003). Statistical analysis of a Weibull extension model, Communications in Statistics: Theory & Methods 32(5):913-928.

Zhang, T., and Xie, M.(2007). Failure Data Analysis with Extended Weibull Distribution, Communications in Statistics-Simulation and Computation, 36(3), 579-592.

See Also

qq.weibull.ext for QQ plot and ks.weibull.ext function;

Examples

## Load data sets
data(sys2)
## Maximum Likelihood(ML) Estimates of alpha & beta for the data(sys2)
## Estimates of alpha & beta using 'maxLik' package
## alpha.est = 0.00019114, beta.est = 0.14696242

pp.weibull.ext(sys2, 0.00019114, 0.14696242, main = " ", line = TRUE)