SixSigma (version 0.11.1)

ss.data.bills: Errors in bills data set

Description

This data set contains the number of errors detected in a set of bills and the name of the person in charge of the bill.

Usage

data("ss.data.bills")

Format

A data frame with 32 observations on the following 3 variables.

nbill

a numeric vector identifying a given bill

clerk

a character vector for the clerk responsible for the bill

errors

a character vector with the number of errors in the bill

Details

This data set illustrates concepts in the book ``Quality Control with R''.

References

Cano, E.L. and Moguerza, J.M. and Prieto Corcoba, M. (2015) Quality Control with R. An ISO Standards Approach. Springer.

Examples

data(ss.data.bills)
str(ss.data.bills) 
barplot(table(ss.data.bills$clerk), 
    main = "number of invoices")
aggregate(errors ~ clerk, ss.data.bills, sum)