Radar chart - Wikipedia. For the extension of Euler diagrams, see Spider diagram.
The relative position and angle of the axes is typically uninformative. The radar chart is also known as web chart, spider chart, star chart. The data length of a spoke is proportional to the magnitude of the variable for the data point relative to the maximum magnitude of the variable across all data points.
A line is drawn connecting the data values for each spoke. This gives the plot a star- like appearance and the origin of one of the popular names for this plot. The star plot can be used to answer the following questions: ?
Typically, radar charts are generated in a multi- plot format with many stars on each page and each star representing one observation. There is no separation into foreground and background variables. Instead, the star- shaped figures are usually arranged in a rectangular array on the page. It is somewhat easier to see patterns in the data if the observations are arranged in some non- arbitrary order (if the variables are assigned to the rays of the star in some meaningful order). Instead, one may use a simple line graph, particularly for time series. For example, 2, 2 takes up 4 times the area of 1, 1.
This is a general issue with area graphs, and area is hard to judge – see . For example, for diagrams of data that vary over a 2. Their primary weakness is that their effectiveness is limited to data sets with less than a few hundred points. After that, they tend to be overwhelming. The variable list for the sample star plot is: Price.
Mileage (MPG)1. 97. Repair Record (1 = Worst, 5 = Best)1. Repair Record (1 = Worst, 5 = Best)Headroom. Rear Seat Room. Trunk Space. Weight. Length. We can look at these plots individually or we can use them to identify clusters of cars with similar features. For example, we can look at the star plot of the Cadillac Seville (the last one on the image) and see that it is one of the most expensive cars, gets below average (but not among the worst) gas mileage, has an average repair record, and has average- to- above- average roominess and size. We can then compare the Cadillac models (the last three plots) with the AMC models (the first three plots).
This comparison shows distinct patterns. The AMC models tend to be inexpensive, have below average gas mileage, and are small in both height and weight and in roominess.
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The Cadillac models are expensive, have poor gas mileage, and are large in both size and roominess. Tague (2. 00. 5) The quality toolbox. Content Strategy Workshops. March 3, 2. 01. 5. Retrieved December 1. Star Plot in: e- Handbook of Statistical Methods.
Date created)^Chambers, John, William Cleveland, Beat Kleiner, and Paul Tukey, (1. Graphical Methods for Data Analysis. Mayr, Georg von (1. Die Gesetzm. Linien- Diagramme im Kreise: Line charts in circles.^Michael Friendly (2. Paper presented at the SAS SUGI 1. Conference, Apr, 1.
Ron Basu (2. 00. 4). Implementing Quality: A Practical Guide to Tools and Techniques. Peltiertech. com. Retrieved 2. 01. 3- 0. Excelcharts. com. Retrieved 2. 01. 3- 0. Support Analytics Blog.
December 2. 00. 7. Archived from the original on 2. I- ocean. blogspot. Retrieved 2. 01. 3- 0. Microsoft Developer Network. Retrieved December 1.
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