vcd (version 1.4-13)

SpaceShuttle: 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.

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)