Microsoft Office Tutorials and References
In Depth Information
Creating histograms
We created our own distribution bins for this model, but you can let the Histogram
tool determine the divisions for you. Leave the Bin Range box blank to create evenly
distributed bin intervals with the minimum and maximum values in the input range as
beginning and ending points. The number of intervals is equal to the square root of the
number of input values.
Here are a few facts to keep in mind when using the Histogram tool:
In the Frequency column, the histogram reports the number of input values that are
equal to or greater than the bin value but less than the next bin value.
The last value in the table reports the number of input values equal to or greater
than the last bin value.
Select the Pareto check box in the Histogram dialog box to sort the output in
descending order.
Select the Cumulative Percentage option to add a column showing the percentage of
total input values accounted for at each bin level, as shown in Figure 17-10.
If you select the Chart Output option in the Histogram dialog box, the Histogram
tool simultaneously generates a chart and places it on the worksheet.
For everything you need to know about charts, see Part 6, “Creating charts.”
INSIDE OUT Beware of bin formulas
Notice that the Histogram tool duplicates your column of bin values in its Bin column,
which is convenient if you place the output somewhere else in your workbook. But
because the Histogram tool copies the bin values, it’s best if the bin range contains
numeric constants rather than formulas. If you do use formulas, be sure they don’t
include relative references; otherwise, when the Histogram tool copies the range, the
formulas might produce unwanted results.
Analyzing distribution with the FREQUENCY function
It’s easy to use the Histogram tool to generate a new frequency distribution table whenever
you change the input values, but the Histogram tool generates static numbers (numeric
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