Define Distributions

Three ways to display the Define Distributions dialog box, where you can customize the parameter estimates for each fitted distribution as well as specify a custom range from which to simulate data:

Distribution

Select the distribution that you want to customize from this drop-down list.

Parameters

Specify whether to use the default parameter estimates or to use custom parameters.

Depending upon the specific distribution, there may be one or all of the following types of parameters available for you to customize: location, scale, and shape.

  • A location parameter shifts a distribution along the abscissa.
  • A scale parameter shrinks or stretches a distribution.
  • A shape parameter is neither a location nor a scale parameter. It determines the shape of the distribution.

Default

Select the Default option button to use the default parameter estimates computed by Statistica for the selected distribution.

User defined

Select the User defined option button to specify custom parameters for the selected distribution.

Location

A location parameter shifts a distribution along the abscissa.

Scale

A scale parameter shrinks or stretches a distribution.

Truncate

Min

Select the Min check box to truncate the selected distribution to the specified minimum value, and enter the value in the adjacent box.

Max

Select the Max check box to truncate the selected distribution to the specified maximum value, and enter the value in the adjacent box.

OK

Click OK to save the changes made in this dialog box, close it, and return to the Fit Distributions Results dialog box.

Cancel

Click Cancel to discard any changes made in this dialog box and return to the Design Simulation dialog box or the Fit Distributions Results dialog box.