ex04.86 {Devore6} | R Documentation

## data from exercise 4.86

### Description

The `ex04.86` 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. (2003) Probability and Statistics for Engineering and the Sciences (6th ed), Duxbury

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

### Examples

    data(ex04.86)
    attach(ex04.86)
    boxplot(loadlife, ylab = "Load-Life (million revs)",
            main = "Bearing load-lifes from exercise 4.86",
            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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