Documentation

Histogram

View Histogram

To switch from a dot plot to a histogram, change the Y-Axis parameter to "Histogram". To switch from a histogram to a dot plot, switch the Y-Axis parameter back to anything else.

Scaling Options

There are multiple scales that can be selected for the y-axis when displaying a histogram. When you are viewing a single histogram the histogram curve will not look different when selecting different scales. However, when viewing histogram overlays, the scaling can make a big difference.

You can switch between different histogram scaling types by clicking on the y-axis scale of the histogram itself. That will bring up a menu, where you can select the scaling type you would like to apply. Scaling options include:

Absolute Count

The y-axis is scaled to the the number of events in each histogram bin.

Normalized to Mode

The histogram bins are normalized to the mode (the peak of the histogram) and displayed as a percentage of the peak value.

Smooth

Enable to make your histogram less pointy.

Auto Max Value

If you use an "Absolute Count" for you axis, you can check this option to automatically set the max y-axis value to the absolute value of the highest bin. Alternatively you can uncheck this option and set your own custom maximum value for the y-axis.

Bins

Histograms are created by dividing the x-axis parameter values into equally sized bins, putting all events into their appropriate bins and then totaling up how many events are in each bin. If you want to change the number of bins that the x-axis is divided into you can set a custom value here. Increasing the number of bins generally has the effect of making the histogram appear less smooth and making the absolute count of each bin lower.

Display Options

There are several options that can adjust the display style for histograms. You can change the settings by right clicking on a histogram plot. Options include:

Line Thickness

You can select from thin, medium, or thick lines for a histogram

Color

By selecting "Colors" after right-clicking on the plot, you can change the color for a histogram (and its overlays).

Fill

Histogram fill can be toggled on or off and determines whether the area under the curve for the histogram is filled in with a color or left blank.