The star plot's main purpose is to display multivariate data (and best represents small-medium data sets). Each star acts as a single observation, and represents one factor. Star plots are useful in determining things like if there are any outliers, if there are any domination observations, and which observations are most similar.
The star plot shown above is of 16 cars, sorted by factors like mileage, price, weight, head room, etc., for the year 1979.
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