Radar charts differ from glyph plots in that all variables are used to construct the plotted star figure. The star plot was first used by Georg von Mayr in 1877. Typically, radar charts are generated in a multi-plot format with many stars on each page and each star representing one observation.
Each star represents a single observation.
Radar charts are a useful way to display multivariate observations with an arbitrary number of variables. The star plot can be used to answer the following questions: This gives the plot a star-like appearance and the origin of one of the popular names for this plot. A line is drawn connecting the data values for each spoke.
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. The radar chart is a chart and/or plot that consists of a sequence of equi-angular spokes, called radii, with each spoke representing one of the variables.
