# Statistics

There are several statistics that can be computed by FlowJo. Except for the **Frequency of Parent**, which is always displayed for each subpopulation once it has been gated, statistics must be added as separate nodes in the workspace
window. Each statistic node holds a single value (a single statistic); it is recomputed whenever a gate that affects that subset changes. The full list of statistics includes such computations as **median, mean**,
or **frequency within a parent population.**

Statistics can be added to populations in two ways: (1) by selecting one or more populations and clicking on the **Statistic** function buttonin the workspace window; this adds statistics
to the selected populations, or (2) by viewing a population in a graph window and clicking on the **Statistic** button in that window. Both ways brings up the Statistics Dialog window.

Statistics are displayed in the workspace window whenever they are calculated. If a statistic node in the workspace does not show its value, then you may request it to be computed. Select any node which has that statistic as a descendant (i.e., the
population to which it is attached, or any parent of that population), and click the **Recalculate** button or select **Recalculate** from the **Workspace** menu. The **F5** function key can also be used to recalculate. All statistics can be hidden from view by selecting **Hide Statistics **in the Workspace menu (show them by selecting **Show Statistics **in the
same menu.)

Statistics can be conveniently organized and exported by the table editor. Statistics nodes can be dragged to the table definition; when the table is computed, then all statistic nodes will be updated and computed.

In addition, you can drag statistics into the layout editor.� This will create a text box containing the statistic description and the value; it will be updated whenever the statistic is modified (i.e., it is "live").

Now you can build a table of statistics within the Layout editor. Click the Sigma button in the Layout editor's tool palette. Drag a rectangle in the area where you want your statistical table to appear. To construct the table, click here.