Alter One Parameter and Recalculate

The Alter One Parameter (and Recalculate) feature allows you to manually alter one of the parameter values and then have the software estimate the other parameter values that would result in a good fit for the distribution. The ranks and the likelihood function are assumed to remain the same; however, unlike the Alter Parameters without Recalculation method, the Fisher Matrix is evaluated at the altered parameter values. The solution line in the plots and all other subsequent analyses will be based on the new values of the parameters.

To access this feature, choose ALTA > Options > Alter Parameters > Alter One Parameter (and Recalculate).

After you choose which parameter to alter, a window will appear where you can enter a new value for the parameter. After you enter the new value and click OK, the window will close and the software will folio will automatically calculate the remaining parameters.

This option is intended to enable you to experiment with possible alternative scenarios by altering the estimated parameters of the data set. Any plots or QCP results will be based on the altered parameters, and therefore may be appropriate only within the context of your specific “what-if” analysis.