qqtest (version 1.0)

penicillin: 31 contrast sums from a 32 run 2^(5-0) factorial experiment on penicillin production.

Description

Values are arranged in decreasing order of absolute magnitude. Daniel(1959) uses the data to illustrate the use of half-normal plots. In his words: "We need, of course, some rule of inference that will help us to be objective in judging whether or not the largest effects are real."

Usage

data("penicillin")

docType

data

source

From Daniel (1959) who references the data from Davies (1956). Stable JSTOR URL: http://www.jstor.org/stable/1266715?origin=JSTOR-pdf

Details

Name of the contrast effect is given as the row name of each value.

References

Cuthbert Daniel (1959) ``Use of Half-Normal Plots in Interpreting Factorial Two-Level Experiments'', Technometrics, Vol. 1, No. 4 (Nov., 1959), pp. 311-341. Davies, O. L. (1956) Design and Analysis of Industrial Experiments, (Editor), Second Edition, Oliver and Boyd, London, and Hafner, New York.

Examples

data(penicillin)
## Daniel's half-normal plot (from qqtest package)
qqtest(penicillin, dist="half-normal")