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Data in the real world is often highly variable, and a reference line can be used to compare a given data point, or variable pattern, to a baseline. Visual Analytics offers a set of reference values based on the user's underlying data including average, median, minimum, maximum, sum, or a user defined constant. You may also extend your global aggregate function to the plotted data with total.
Bands are a pair of linked reference lines and provide a range of values for comparison as opposed to a single line. This is often used to determine when a given measure is leaving an acceptable threshold--an abnormally high temperature in an office, for example. In a combined plot of all offices on a floor, this set of reference bands would be much easier to interpret than simply a series of coincident temperature plots. All the values for reference lines are available for bands as well.
The box and whisker plot combines a set of reference values into a single overlay. The median, the box plot's center line, is the central value in the data set, with half the points above and half below. The upper and lower quartiles, or upper and lower boxes, further divide the set above and below the median. In this way, we can visualize how closely packed the data are in the upper and lower half of a given set. Not only does the box plot visually divide the data, but it can also indicate which data points fall outside the expected variability of the set (outliers). The outliers are marked by the whiskers in the box and whisker plot. You can choose whether or not to include outliers in the visualization.