Bins are equally-spaced intervals that are used to sort data on graphs. By default, the number of values in each bin is represented by bars on histograms and by stacks of dots on dotplots.
For example, on the following histogram, the height of each bar represents the frequency of observations within the corresponding range of torque values. On the following dotplot, the height of each stack of dots represents the frequency of observations within the corresponding range of calcium values.
To edit bins, double-click the bars or dots. On the Binning tab, you can edit the following items.
Change the interval type
Select one of the following interval types.
Midpoint: Bins are defined by their center values (default). In the following histogram, the bins are defined by the midpoints 55, 60, 65, 70, and so on.
Cutpoint: Bins are defined by their boundaries. In the following histogram, the bins are defined by the boundaries 52-56, 56-60, 60-64, and so on.
Change the interval definition
You can change the number of bins or specify the bin intervals. The number of bins affects the appearance of a graph. If there too few bins, the graph will be unrefined and will not represent the data well. If there are too many bins, many of the bins will be unoccupied and the graph may have too much detail.
For example, the following histograms represent the same data with different numbers of bins. The middle graph (15 bins) is the Minitab default for these data.
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