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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