normaldata {bayess} R Documentation

## Normal dataset

### Description

This dataset is used as "the" normal dataset in Chapter 2. It is linked with the famous Michelson-Morley experiment that opened the way to Einstein's relativity theory in 1887. It corresponds to the more precise experiment of Illingworth in 1927. The datapoints are measurment of differences in the speeds of two light beams travelling the same distance in two orthogonal directions.

### Usage

data(normaldata)

### Format

A data frame with 64 observations on the following 2 variables.

x1

index of the experiment

x2

averaged fringe displacement in the experiment

### Details

The 64 data points in this dataset are associated with session numbers, corresponding to two different times of the day, and they represent the averaged fringe displacement due to orientation taken over ten measurements made by Illingworth, who assumed a normal error model.

data(normaldata)