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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 setgenfan: Time to failure of 70 diesel engine fans.
• hours: hours of service
• status: 1=failure, 0=censored
• Data setifluid: 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 setimotor: 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 setturbine: 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 setvalveSeat: 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)

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