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====== Correlation pie chart ======

A correlation pie chart ranks the importance of the simulation inputs (parameters) on a specified output (at a specified timepoint) and displays the absolute value of the correlation rank coefficient for each input as a slice in a pie diagram. The correlation pie chart is only available with the [[Sensitivity_analysis_toolbox|sensitivity analysis toolbox]].The chart is only available after a probabilistic simulation or a sensitivity analysis has been performed.

The correlation pie chart is an alternative to the [[Tornado_chart|tornado chart]].

===== Creating a correlation pie chart =====

From the [[Results_window|results window]] (Recommended)

  * Right-click an output that you wish to plot and select **Correlation Pie Chart** from the popup-menu.

From the [[Charts_window|charts window]]

  * Right-click the charts window and select **Create | Correlation Pie Chart** from the popup-menu.

===== Editing a correlation pie chart =====

Some properties can be changed directly by using the controls below the chart. For a pie chart there are controls for:

  * **Legend** - Toggle legend on/off
  * **Correlation** - Select ranking method (more information can be found below).
  * **Time-point** - Select time point for the output.

{{:pie_chart.png?600}}

To change other properties either right-click the chart in the [[Charts_window|charts window]] and select **Edit**, or double-click the chart, or click the {{:Edit24.png|Edit}} button in the title bar.

The chart editor has two tabs:

==== Properties ====

This screen let you edit properties such as name and axes, that are common to most charts. Please see [[Editing_chart_properties|editing chart properties]] for more information.

==== Data ====

  * **Output** - Select the target output.
  * **Inputs** - Select the inputs you are interested in. By default all parameters that are included in the probabilistic/sensitivity analysis are selected.
  * **Timepoint** – For time dependent outputs, specify the time point you wish to plot.\\

  * **Max number of bins** – Limits the number of inputs that are shown in the chart. //Default=10//.
  * **Type** – Select which correlation ranking method you wish to use.
    * Spearman’s rank correlation coefficient
    * Pearson product-moment correlation coefficient
    * Standardized regression coefficient
    * Standardized rank regression coefficient
    * Partial correlation coefficient
    * Partial rank correlation coefficient
    * EASI First Order Sensitivity Indices

===== See also =====

  * [[Charts_window|Charts window]]
  * [[Results_window|Results window]]
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