circuit | R Documentation |
Number of nonconformities observed in 26 successive samples of 100 printed circuit boards. Sample 6 and 20 are outside the control limits. Sample 6 was examined by a new inspector and he did not recognize several type of nonconformities that could have been present. Furthermore, the unusually large number of nonconformities in sample 20 resulted from a temperature control problem in the wave soldering machine, which was subsequently repaired. The last 20 samples are further samples collected on inspection units (each formed by 100 boards).
data(circuit)
A data frame with 46 observations on the following 4 variables.
sample number
number of defectives in 100 printed circuit boards (inspection unit)
sample size
trial sample indicator (TRUE/FALSE)
Montgomery, D.C. (1991) Introduction to Statistical Quality Control, 2nd ed, New York, John Wiley & Sons, pp. 173–175
data(circuit) describe(circuit, by = trial) boxplot(x/size ~ trial, data = circuit) plot(x/size ~ sample, data = circuit, type="b")
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