User-Defined Scale (Standard Deviation)

Click the Define standard deviations button on the PLS dialog box - Advanced tab or the PCA dialog box - Advanced tab to display the User-defined scale (standard deviation) dialog box.

Note: It is good practice to scale your analysis variables, particularly when different variables have typical values that differ significantly. This is often the case when different variables pertain to different quantities (e.g., temperature and pressure) or when they are measured in different units (e.g., inches and miles). In cases such as this, independent variables with typically large values will bias the analysis outcome, which may then lead to poor predictions and performance. STATISTICA resolves this problem by applying a linear transformation, which pre-processes the variables to zero mean and unit (default) or a user-defined standard deviation.

Specify the individual scaling of each variable.

Element Name Description
Common Value Enter a Common Value to use for scaling for all of the variables.
Apply Click the Apply button to apply the value specified in the Common Value field to all of the variables.
OK Click the OK button to close this dialog box and return to the Advanced tab.
Cancel Click the Cancel button to close this dialog box and return to the Advanced tab; any changes made will be disregarded.