R: Reliability data sets

reliability {survival} | R Documentation

## Reliability data sets

### Description

A set of data for simple reliablility analyses, taken from the book by Meeker and Escobar.

### Details

- `capacitor`: Data from a factorial experiment on the life of glass capacitors as a function of voltage and operating temperature. There were 8 capacitors at each combination of temperature and voltage. Testing at each combination was terminated after the fourth failure.

  - `temperature`: temperature in degrees celcius

  - `voltage`: applied voltage

  - `time`: time to failure

  - `status`: 1=failed, 0=censored

- `cracks`: Data on the time until the development of cracks in a set of 167 identical turbine parts. The parts were inspected at 8 selected times.

  - day: time of inspection

  - fail: number of fans found to have cracks, at this inspection

- Data set `genfan`: Time to failure of 70 diesel engine fans.

  - `hours`: hours of service

  - `status`: 1=failure, 0=censored

  Data set `ifluid`: A data frame with two variables describing the time to electrical breakdown of an insulating fluid.

  - `time`: hours to breakdown

  - `voltage`: test voltage in kV

- Data set `imotor`: Breakdown of motor insulation as a function of temperature.

  - temp: temperature of the test

  - time: time to failure or censoring

  - status: 0=censored, 1=failed

- Data set `turbine`: Each of 432 turbine wheels was inspected once to determine whether a crack had developed in the wheel or not.

  - hours: time of inspection (100s of hours)

  - inspected: number that were inspected

  - failed: number that failed

  Data set `valveSeat`: Time to replacement of valve seats for 41 diesel engines. More than one seat may be replaced at a particular service, leading to duplicate times in the data set. The final inspection time for each engine will have status=0.

  - id: engine identifier

  - time: time of the inspection, in days

  - status: 1=replacement occured, 0= not

### References

Meeker and Escobar, Statistical Methods for Reliability Data, 1998.

### Examples

    data(capacitor)
    survreg(Surv(time, status) ~ temperature + voltage, capacitor)

[Package survival version 3.2-7 Index]