Alter Parameters Without Recalculation

The Alter Parameters window allows you to alter the values of the calculated parameters, assuming that the ranks, the likelihood function and the Fisher Matrix (evaluated at the original parameter estimates) remain the same. In plots, the position of the data points remain the same but the solution line and all subsequent analyses made via the QCP and other tools are based on the modified parameter values.

After you calculate the parameters, you can select this option by choosing ALTA > Options > Alter Parameters > Alter Parameters (w/o) Recalculation or by clicking the icon on the control panel.

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.