# Chensurvival: Survival related functions for the Chen distribution In reliaR: Package for some probability distributions.

## Description

Conditional reliability function (crf), hazard function, hazard rate average (HRA) and survival function for the Chen distribution with shape parameter `beta` and scale parameter `lambda`.

## Usage

 ```1 2 3 4``` ```crf.chen(x, t = 0, beta, lambda) hchen(x, beta, lambda) hra.chen(x, beta, lambda) schen(x, beta, lambda) ```

## Arguments

 `x` vector of quantiles. `beta` shape parameter. `lambda` scale parameter. `t` age component.

## Value

`crf.chen` gives the conditional reliability function (crf), `hchen` gives the hazard function, `hra.chen` gives the hazard rate average (HRA) function, and `schen` gives the survival function for the Chen distribution.

## References

Chen, Z.(2000). A new two-parameter lifetime distribution with bathtub shape or increasing failure rate function, Statistics and Probability Letters, 49, 155-161.

Pham, H. (2003). Handbook of Reliability Engineering, Springer-Verlag.

`dchen` for other Chen distribution related functions
 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21``` ```## Maximum Likelihood(ML) Estimates of beta & lambda ## beta.est = 0.262282404, lambda.est = 0.007282371 ## Load data sets data(sys2) ## Reliability indicators: ## Reliability function schen(sys2, 0.262282404, 0.007282371) ## Hazard function hchen(sys2, 0.262282404, 0.007282371) ## hazard rate average(hra) hra.chen(sys2, 0.262282404, 0.007282371) ## Conditional reliability function (age component=0) crf.chen(sys2, 0.00, 0.262282404, 0.007282371) ## Conditional reliability function (age component=3.0) crf.chen(sys2, 3.0, 0.262282404, 0.007282371) ```