ex04.84 {Devore5}R Documentation

data from exercise 4.84

Description

The ex04.84 data frame has 20 rows and 1 columns of bearing load lifetimes.

Format

This data frame contains the following columns:

loadlife
a numeric vector of bearing load life (million revs) for bearings tested at a 6.45 kN load.

Source

Devore, J. L. (2000) Probability and Statistics for Engineering and the Sciences (5th ed), Duxbury

(1984) "The load-life relationship for M50 bearings with silicon nitrate ceramic balls", Lubrication Engineering, 153–159.

Examples

data(ex04.84)
attach(ex04.84)
boxplot(loadlife, ylab = "Load-Life (million revs)",
        main = "Bearing load-lifes from exercise 4.84",
        col = "lightgray")
## Normal probability plot
qqnorm(loadlife, ylab = "Load-life (million revs)")
qqline(loadlife)
## Weibull probability plot
plot(
  log(-log(1 - (seq(along = loadlife) - 0.5)/length(loadlife))),
  log(sort(loadlife)), xlab = "Theoretical Quantiles",
  ylab = "log(load-life) (log(million revs))",
  main = "Weibull Q-Q Plot", las = 1)
detach()

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