morley {base} | R Documentation |
The classical data of Michaelson and Morley on the speed of light. The data consists of five experiments, each consisting of 20 consecutive `runs'. The response is the speed of light measurement, suitably coded.
data(morley)
A data frame contains the following components:
Expt
Run
Speed
The data is here viewed as a randomized block experiment with `experiment' and `run' as the factors. `run' may also be considered a quantitative variate to account for linear (or polynomial) changes in the measurement over the course of a single experiment.
A. J. Weekes (1986) A Genstat Primer. London: Edward Arnold.
data(morley) morley$Expt <- factor(morley$Expt) morley$Run <- factor(morley$Run) attach(morley) plot(Expt, Speed, main = "Speed of Light Data", xlab = "Experiment No.") fm <- aov(Speed ~ Run + Expt, data = morley) summary(fm) fm0 <- update(fm, . ~ . - Run) anova(fm0, fm) detach(morley)