pistonrings: Piston rings data

In qcc: Quality Control Charts

Description

Piston rings for an automotive engine are produced by a forging process. The inside diameter of the rings manufactured by the process is measured on 25 samples, each of size 5, for the control phase I, when preliminary samples from a process being considered 'in control' are used to construct control charts. Then, further 15 samples, again each of size 5, are obtained for phase II.

Usage

data(pistonrings)

Format

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

diameter

a numeric vector

sample

sample ID

trial

preliminary 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)

Example output

Package 'qcc' version 2.7
Type 'citation("qcc")' for citing this R package in publications.
    diameter         sample        trial        
 Min.   :73.97   Min.   : 1.00   Mode :logical  
 1st Qu.:74.00   1st Qu.:10.75   FALSE:75       
 Median :74.00   Median :20.50   TRUE :125      
 Mean   :74.00   Mean   :20.50                  
 3rd Qu.:74.01   3rd Qu.:30.25                  
 Max.   :74.04   Max.   :40.00                  

qcc documentation built on May 2, 2019, 9:15 a.m.