xmp04.30 {Devore6} | R Documentation

## data from Example 4.30

### Description

The `xmp04.30` data frame has 10 rows and 1 columns of lifetimes of power apparatus insulation.

### Format

This data frame contains the following columns:

lifetime
  a numeric vector of lifetimes (hr) of power apparatus insulation under thermal and electrical stress.

### Source

Devore, J. L. (2003) Probability and Statistics for Engineering and the Sciences (6th ed), Duxbury

(1985) "On the estimation of life of power apparatus under combined electrical and thermal stress", IEEE Transactions on Electrical Insulation, 70–78.

### Examples

    data(xmp04.30)
    attach(xmp04.30)
    ## Try normal probability plot first
    qqnorm(lifetime, ylab = "Lifetime (hr)")
    qqline(lifetime)
    ## Weibull probability plot, compare Figure 4.36, p. 194
    plot(log(-log(1 - seq(0.05, 0.95, 0.1))),
         log(sort(lifetime)), xlab = "Theoretical Quantiles",
         ylab = "log(Lifetime) (log(hr))",
         main = "Weibull Q-Q Plot", las = 1)
    detach()

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