Steel {glmtoolbox}

Hardened Steel

Description

This dataset consists of failure times for hardened steel specimens in a rolling contact fatigue test. Ten independent observations were taken at each of the four contact stress values. Response is the time that each specimen of hardened steel failed.

Usage

data(Steel)

Format

A data frame with 40 rows and 2 variables:

stress

a numeric vector indicating the values of contact stress, in pounds per square inch x 10^{-6}.

life

a numeric vector indicating the length of the time until the specimen of the hardened steel failed.

References

McCool J. (1980) Confidence limits for Weibull regression with censored data. Transactions on Reliability 29:145-150.

Examples

dev.new()
data(Steel)
with(Steel,plot(log(stress), log(life), pch=16, xlab="Log(Stress)", ylab="log(Life)"))