Radar Chart

Skill level: Basic

Description

The radar chart is a graphical method of displaying data in the form of a two-dimensional chart of three or more variables represented on axes starting from the same point. Also commonly known as spider charts, web charts, or star plots, radar charts are particularly useful when examining several factors that are related to one item.

Benefits

  • Provides insight to potential improvement opportunities
  • Helps to understand what variables are dominant for a given process
  • Helps to understand which observations are most similar (are there clusters of observations?)
  • Helps to understand if there are outliers
  • Displays the performance metrics of any process and allows the viewer to see opportunities quickly

How to Use

  • Step 1.  Identify the categories or variables under investigation.
  • Step 2.  Standardize categories or variable definitions.
  • Step 3.  Collect data that indicate the strength or weakness of each variable.
  • Step 4.  Plot the data values for each variable of the appropriate “spoke” of the chart.
  • Step 5.  Interpret and use data.

Relevant Definitions

Not Applicable

Example

In multiple voice of the customer interviews about a Kaizen event, interviewees were asked to rate six variables as they related to the process. For example, if training was the best it could be, the interviewee would rate training as a 5. A rating of 1 would mean it was completely ineffective or absent.

The six variables examined included:

  • Safety
  • Training
  • 5S
  • Leadership
  • Standard operating procedures (SOP)
  • Metrics

The figure below shows the results plotted on a radar chart. With a score of 2, training was the largest opportunity. The 5S system was rated the best component of the process with a score of 5 (needing no improvement).

Radar_Chart_Figure

 

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