SMPracticals (version 1.3-1)

marking: Examination Marking Data

Description

The data are from an experiment to compare how different markers assess examination scripts, some of which were original and others of which were photocopies.

Usage

data(marking)

source

Lindley, D. V. (1961) An experiment in the marking of an examination (with Discussion). Journal of the Royal Statistical Society, series A, 124, 285--313.

Details

Normally each marker had a different batch of scripts, but for the experiment one script was taken at random from each batch and replaced after three copies of it had been made. The three copies were sent to the other three markers who assessed them, while the original was replaced and assessed in the usual way. Each of the four copies was therefore assessed by a single marker, but the three markers who had a copy knew that the script was part of the experiment, while the person marking the original did not know it to be part of the experiment. The experiment was repeated at another examination, with the same examiners, but different scripts.

Examples

data(marking)
## maybe str(marking) ; plot(marking) ...