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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Reliability data sets</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for reliability {survival}"><tr><td>reliability {survival}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Reliability data sets</h2> <h3>Description</h3> <p>A set of data for simple reliablility analyses, taken from the book by Meeker and Escobar. </p> <h3>Details</h3> <ul> <li> <p><code>capacitor</code>: 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. </p> <ul> <li> <p><code>temperature</code>: temperature in degrees celcius </p> </li> <li> <p><code>voltage</code>: applied voltage </p> </li> <li> <p><code>time</code>: time to failure </p> </li> <li> <p><code>status</code>: 1=failed, 0=censored </p> </li></ul> </li> <li> <p><code>cracks</code>: 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. </p> <ul> <li><p> day: time of inspection </p> </li> <li><p> fail: number of fans found to have cracks, at this inspection </p> </li></ul> </li> <li><p> Data set <code>genfan</code>: Time to failure of 70 diesel engine fans. </p> <ul> <li> <p><code>hours</code>: hours of service </p> </li> <li> <p><code>status</code>: 1=failure, 0=censored </p> </li></ul> <p>Data set <code>ifluid</code>: A data frame with two variables describing the time to electrical breakdown of an insulating fluid. </p> <ul> <li> <p><code>time</code>: hours to breakdown </p> </li> <li> <p><code>voltage</code>: test voltage in kV </p> </li></ul> </li> <li><p> Data set <code>imotor</code>: Breakdown of motor insulation as a function of temperature. </p> <ul> <li><p> temp: temperature of the test </p> </li> <li><p> time: time to failure or censoring </p> </li> <li><p> status: 0=censored, 1=failed </p> </li></ul> </li> <li><p> Data set <code>turbine</code>: Each of 432 turbine wheels was inspected once to determine whether a crack had developed in the wheel or not. </p> <ul> <li><p> hours: time of inspection (100s of hours) </p> </li> <li><p> inspected: number that were inspected </p> </li> <li><p> failed: number that failed </p> </li></ul> <p>Data set <code>valveSeat</code>: 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. </p> <ul> <li><p> id: engine identifier </p> </li> <li><p> time: time of the inspection, in days </p> </li> <li><p> status: 1=replacement occured, 0= not </p> </li></ul> </li></ul> <h3>References</h3> <p>Meeker and Escobar, Statistical Methods for Reliability Data, 1998. </p> <h3>Examples</h3> <pre> data(capacitor) survreg(Surv(time, status) ~ temperature + voltage, capacitor) </pre> <hr /><div style="text-align: center;">[Package <em>survival</em> version 2.44-1.1 <a href="00Index.html">Index</a>]</div> </body></html>