Working with Histograms

About Histograms

A histogram represents 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: The minimum and maximum values on the histogram axis might not match the actual extent of your data values.

Specify Properties for a Histogram

On the Properties tab, you can specify the following options:

Name

specifies the name of the visualization.

Graph title

specifies the title that appears above the graph.

Note: The Graph title is disabled if you select Generate graph titles.

Generate graph titles

specifies that the graph title is generated automatically based on the data items in the visualization.

Show grid lines

displays grid lines for each tick on the response axis.

Bar direction

specifies whether the bars are vertical or horizontal.

Scale

specifies the statistic that is used on the response axis. Select Count to show the data frequency, or select Percent to show a percentage.

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.

Note: In order to create bins at a useful interval, the histogram might create additional bins beyond the number that you specify.

Data Roles for a Histogram

The basic data role for a histogram is a measure. You can assign only one measure to a histogram.