Parallel coordinate plots are often used explore relationships among variables. In a sense, one observed subject conveyed in a parallel coordinate plot could be thought similar to one star plot. Each vertical axis represents a range of values for one variable, and the corresponding values for an observation are plotted along them and connected with a line. This plot represents data from a study of three different flowers: setosa, versicolor, and virginica. The four variables were: sepal width, sepal length, petal width, and petal length. From the multitude of samples, you can see that setosa had the shortest petals, followed by versicolor, then virginica with the longest petals of the three species.
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