SpaceShuttle {vcd} | R Documentation

## Space Shuttle O-ring Failures

### Description

Data from Dalal et al. (1989) about O-ring failures in the NASA space shuttle program. The damage index comes from a discussion of the data by Tufte (1997).

### Usage

    data(SpaceShuttle)

### Format

A data frame with 24 observations and 6 variables.

FlightNumber
  Number of space shuttle flight.
Temperature
  temperature during start (in degrees F).
Pressure
  pressure.
Fail
  did any O-ring failures occur? (no, yes).
nFailures
  how many (of six) 0-rings failed?.
Damage
  damage index.

### Source

Michael Friendly (2000), Visualizing Categorical Data: http://euclid.psych.yorku.ca/ftp/sas/vcd/catdata/orings.sas

### References

S. Dalal, E. B. Fowlkes, B. Hoadly (1989), Risk analysis of the space shuttle: Pre-Challenger prediction of failure, Journal of the American Statistical Association, 84, 945–957.

E. R. Tufte (1997), Visual Explanations: Images and Quantities, Evidence and Narrative. Graphics Press, Cheshire, CT.

M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.

### Examples

    data(SpaceShuttle)
    plot(nFailures/6 ~ Temperature, data = SpaceShuttle,
         xlim = c(30, 81), ylim = c(0,1),
         main = "NASA Space Shuttle O-Ring Failures",
         ylab = "Estimated failure probability",
         pch = 19, col = 4)
    fm <- glm(cbind(nFailures, 6 - nFailures) ~ Temperature,
              data = SpaceShuttle,
              family = binomial)
    lines(30 : 81,
          predict(fm, data.frame(Temperature = 30 : 81), type = "re"),
          lwd = 2)
    abline(v = 31, lty = 3)

[Package vcd version 0.9-6 Index]