Working with Histograms
About Histograms
A histogram displays the distribution of values for a single measure. A series of
bars represents the number of observations in the measure that match a specific value or value range. The bar height can represent either the exact number of observations or the percentage of all observations
for each value range.
Note: If you use the default number
of bins, then the minimum and maximum values on the histogram axis
might not match the actual extent of your data values. If you specify
the number of histogram bins, then the histogram axis matches your
data values exactly.
Data Roles for a Histogram
The basic data role
for a histogram is a measure. You can assign only one measure to a
histogram.
Specify Properties for a Histogram
On the Properties tab,
you can specify the following options:
Name
specifies the name of the visualization.
Title
specifies the title
that appears above the graph.
Note: The Title option
is disabled if you select Generate graph title.
Generate graph title
specifies that the graph title is generated automatically based on the data items in the visualization.
Show grid lines
Bar direction
specifies whether the
bars are vertical or horizontal.
Frequency
specifies whether the
frequency is displayed as a count (Count)
or as a percentage (Percent).
Note: The frequency values are
based on the data that is shown in the visualization (after filters
and other data selections have been applied).
Use default bin count
specifies whether to use the default number of bins (value ranges) for the histogram. The default number of bins is determined by the
number of data values in your histogram.
Bin count
specifies the number of bins (value ranges) for the histogram.
Reference Lines
adds reference lines to the visualization. To create a reference line, click 
, and then specify the parameters for the line in the New Reference Line window.
, and then specify the parameters for the line in the New Reference Line window.
The name of each reference line appears below the Reference Lines option. You can edit or delete your reference lines by using the icons next to each
name.
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