Orange juice data
Frozen orange juice concentrate is packed in 6-oz cardboard cans. These cans are formed on a machine by spinning them from cardboard stock and attaching a metal bottom panel. A can is then inspected to determine whether, when filled, the liquid could possible leak either on the side seam or around the bottom joint. If this occurs, a can is considered nonconforming. The data were collected as 30 samples of 50 cans each at half-hour intervals over a three-shift period in which the machine was in continuous operation. From sample 15 used a new batch of cardboard stock was punt into production. Sample 23 was obtained when an inexperienced operator was temporarily assigned to the machine. After the first 30 samples, a machine adjustment was made. Then further 24 samples were taken from the process.
data(orangejuice)
A data frame with 54 observations on the following 4 variables:
sample id
number of defectives
sample sizes
trial samples (TRUE/FALSE)
Montgomery, D.C. (1991) Introduction to Statistical Quality Control, 2nd ed, New York, John Wiley & Sons, pp. 152–155.
data(orangejuice) orangejuice$d <- orangejuice$D/orangejuice$size attach(orangejuice) summary(orangejuice) boxplot(d ~ trial) mark <- ifelse(trial, 1, 2) plot(sample, d, type="b", col=mark, pch=mark) detach(orangejuice)
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