circuit: Circuit boards data

Description Usage Format References Examples

Description

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).

Usage

1

Format

A data frame with 46 observations on the following 3 variables.

x

number of defectives in 100 printed circuit boards (inspection unit)

size

sample size

trial

trial sample indicator (TRUE/FALSE)

References

Montgomery, D.C. (1991) Introduction to Statistical Quality Control, 2nd ed, New York, John Wiley & Sons, pp. 173–175

Examples

1
2
3
4
5
6

Example output

Package 'qcc' version 2.7
Type 'citation("qcc")' for citing this R package in publications.
       x              size       trial        
 Min.   : 5.00   Min.   :100   Mode :logical  
 1st Qu.:16.00   1st Qu.:100   FALSE:20       
 Median :19.00   Median :100   TRUE :26       
 Mean   :19.17   Mean   :100                  
 3rd Qu.:22.00   3rd Qu.:100                  
 Max.   :39.00   Max.   :100                  

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