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The Source drop down box identifies columns containing data. This allows selection of the histogram column from a list of column numbers or column titles. Three Binning Methods are available - Automatic, Min/Max and Start/End.
Automatic creates bin boundaries that fall on tick marks or sub-multiples of tick marks. You specify the approximate number of bins and this method finds the closest number of bins to that value with appropriate bin boundaries. Min/Max finds the minimum and maximum of the data and sets the left edge of the first bin to the minimum value and the right edge of the last bin to the maximum value. You may enter or select the number of bins to produce a pleasing result. Min/Max may not result in appropriate bin boundaries so Start/End allows you to specify the left edge of the first bin boundary and the right edge of the last bin boundary. The following options result in bin boundaries every 0.5.
The two types of histograms are shown in Figure 1.
The Normalization option allows results to be expressed as fraction or percent. If Normalization = 1 is selected then the counts in each bin are divided by the total counts. Thus the sum of the histogram bar heights will equal 1.0. For the cumulative the last bar height will equal 1.0. This is shown in Figure 2 where the bar outline has been deselected.
Normalization = 100 results in bar heights summing to 100. This is shown in Figure 3 where the Vertical Step plot is used.
Four types of graphs are provided: Vertical Bar, Vertical Step, Horizontal Bar and Horizontal Step. The Vertical Bar and Vertical Step plots are shown in Figures 2 and 3. Examples of the Horizontal Bar and Horizontal Step are shown in Figure 4.
Bar width may be specified as a percentage (Bar Width%). Using Bar Width% = 1 results in the needle plot shown in Figure 5.
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