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Creating Pareto Charts

Image:Pareto_Chart.png?

The pareto chart is a special type of bar chart accompanied with a line graph. Typically, the vertical bars, whose heights reflect the frequency or impact of problems, are in descending order of significance and the line graph is ascending monotonously.

Pareto charts can be used to identify factors that have the greatest cumulative effect on the system. Thus, it is helpful in screening out the less significant factors in an analysis.

Creating Pareto Chart from the Binned Data

If you have already had binned data, you can create a pareto chart from it by using the Plot: Statistics: Pareto Chart - Binned Data menu command, or click the Pareto Chart - Binned Data button image:Button_Pareto_Chart-Binned_Data.png on the 2D Graphs toolbar. This will bring up the plot_paratobin dialog.

The plot_paretobin dialog

image:plot_paretobin_dialog.png

Recalculate Specify the recalculation mode.
Data Input Range Specify the input range of data.
Count Input Range Specify the input range of count.
Combine Smaller Values Check this box if you want to combine the data of which the counts are below a threshold.
Threshold Specify the method to define the threshold.
  • By Percent
Use percent value to define the threshold.
  • By Count
Use count value to define the threshold.
By Percent Will be enabled when By Percent is chosen in Threshold, the data of which the counts' percentage is smaller than this value will be combined as one category in the plot.
By Count Will be enabled when By Count is chosen in Threshold, the data of which the count number is smaller than this value will be combined as one category in the plot.
Tick Label Specify the tick label for the combined smaller values.
Output Data Specify where to store the calculated data for the plot.

Creating Pareto Chart from the Raw Data

  1. Highlight the column you want to plot.
  2. Select Plot: Statistics: Pareto Chart - Raw Data from main menu or click the Pareto Chart - Raw Data button on the 2D Graphs toolbar to plot the pareto chart.
  3. After the pareto graph is plotted, a result sheet ParetoRaw1 containing the statistic results will be created automatically.