Pareto Chart

The Pareto Chart is bar graph used in quality control studies. The bars represent the categories and are ordered in an increasing fashion. Moreover, a broken line is added to show the cumulative sums.

The data file "Circuits.csv" located at "http://ramanujan.math.trinity.edu/ekwessi/misc/Circuits.csv" represent printed circuits boards, finished and subjected to a final inspection before shipping.

The types of defects for each board rejected at final inspection during a time period are given with their frequencies. 
We can obtain a Pareto chart in R using the command "pareto.chart" in the package "qcc".

>install.packages("qcc")                               # Installing the package "qcc" if not yet installed 
>require(qcc)                                          # Loading the package into the R-workspace
>defect=c(112,35,10,8,5,12)                            #  Assigning the frequency as defect
>names(defect)=c("Low copper Plating","Poor electroless coverage.","Lamination Problems","Plating Separation",
 "Etching Problems","Miscellaneous")                  # Assigning the types of defect
>pareto.chart(defect)                                  #Obtaining the Pareto chart


Going Further


Check with hepl(pareto.chart) all the options of this command.