R: Michaelson-Morley Speed of Light Data

morley {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)

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