pistonrings: Piston rings data
In mflores72000/qcr: Quality Control Review

pistonrings

R Documentation

Piston rings data

Description

This is a database that contains information on the inside diameter of piston rings. Piston rings are manufactured for an automobile engine that are produced through a forging process. This process is considered "in control" and is measured on 25 samples, each of size 5.

Format

A data frame with 200 observations on the following 3 variables.

diameter: A numeric vector.
sample: Sample ID
trial: Trial sample indicator (TRUE/FALSE)

References

Montgomery, D.C. (1991) Introduction to Statistical Quality Control, 2nd ed, New York, John Wiley & Sons, pp. 206–213

Examples


data(pistonrings)
attach(pistonrings)
summary(pistonrings)
boxplot(diameter ~ sample)
plot(sample, diameter, cex=0.7)
lines(tapply(diameter,sample,mean))
detach(pistonrings)

mflores72000/qcr documentation built on July 1, 2023, 9:17 p.m.