Setting Up Additional Calculation Parameters

The following parameters can be set up for non-linear regression:

Calculation parameters.
Coefficient estimation parameters.
Values of initial approximations.

Setting Up Calculation Parameters

To set up calculation parameters, use the Parameters side panel tab.

To display the tab

Method parameters:

Output Series. Specify the series for loading output results.
Confidence Limits Relevance. Set the importance level of confidence limits for a forecast series. Available values range: [0; 1]. Default value is 0.95.

Setting Up Coefficient Estimation

To set up parameters of non-linear regression coefficient estimation, use the Estimation Parameters side panel tab.

To display the tab

Non-linear regression system parameters:

Calculation Accuracy. Specify accuracy of equation calculation. Minimum value: 0.00001; default value: 0.0001.
Maximum Number of Iterations. Set the maximum number of iterations, during which non-linear regression coefficients estimations should be obtained. A great number of iterations gives the highest calculations accuracy but it takes more time.
Minimum value is 1, default value is 500.
Estimation Method. Use the drop-down list to select the estimation method for non-linear regression coefficients.
Use Analytical Derivatives. Selecting this checkbox increases calculation accuracy by calculating analytical derivatives for the non-linear regression equation.
Use Default Initial Approximations. By default, the checkbox is selected, and default initial approximations of equation coefficients are used for calculation. If the checkbox is deselected, custom initial approximations are used. To view and edit initial approximations, use the Equation tab on the statistics panel.

Setting Initial Approximation Values

To set initial approximation values of non-linear regression coefficients, use the Equation tab on the statistics panel. When the non-linear regression calculation is performed, the values of coefficient initial approximations are displayed on the tab.

To display the tab

To edit initial approximation values, enter required initial approximation values to the Initial Approximation column.

The calculated series is recalculated with new values of coefficient initial approximations.

NOTE. To restore default initial approximations, select the Use Default Initial Approximations checkbox on the Estimation Parameters side panel tab. The checkbox is automatically deselected when initial approximation values are edited.