morley                 package:base                 R Documentation

Michaelson-Morley Speed of Light Data

Description:

     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.

Usage:

     data(morley)

Format:

     A data frame contains the following components:

     `Expt' The experiment number, from 1 to 5.

     `Run' The run number within each experiment.

     `Speed' Speed-of-light measurement.

Details:

     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.

Source:

     A. J. Weekes (1986) A Genstat Primer. London: Edward Arnold.

Examples:

     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)

