# qq.weibull.ext: Quantile versus quantile (QQ) plot for the Weibull... In reliaR: Package for some probability distributions.

## Description

The function `qq.weibull.ext()` produces a QQ plot for the Weibull Extension(WE) based on their MLE or any other estimate. Also, a line going through the first and the third quartile can be sketched.

## Usage

 `1` ```qq.weibull.ext(x, alpha.est, beta.est, main = " ", line.qt = 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.qt` logical; if TRUE, a line going by the first and third quartile is sketched. `...` additional arguments to be passed to the underlying plot function.

## Value

The function `qq.weibull.ext()` carries out a QQ 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.

`pp.weibull.ext` for `PP` plot and `ks.weibull.ext` function;

## Examples

 ```1 2 3 4 5 6 7``` ```## 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 qq.weibull.ext(sys2, 0.00019114, 0.14696242, main = " ", line.qt = FALSE) ```

### Example output

```
```

reliaR documentation built on May 1, 2019, 9:51 p.m.