Ribbon
bar. Select the Data tab.
In the Transformations group,
click Filter/Recode and on the
menu, select *Process Invariant Variables* to display the *Process
Invariant Variables* dialog box.

Classic
menus. On the *Data - Data Filtering/Recoding* submenu, select
*Process Invariant Data* to display the *Process Invariant Variables*
dialog box.

Use these options to specify the criteria for determining what variables are invariant.

**Input.
**Use the options in the *Input *group box to specify the
criteria for determining invariant data. Statistica uses this information
to determine which variables should be removed from the data because of
low (or no) variation.

**Variables.**
Click the *Variables* button to display a standard variable selection
dialog box used to select the variables to filter. The selected variables
will be evaluated, and if the relative standard deviation is smaller than
the value specified in the *Relative Standard Deviation* box, the
variable will be removed.

**Cases.**
Click the *Cases* button to display the __ Spreadsheet
Case Selection Conditions__ dialog box, which contains
options to select only specified observations or cases for the data filtering
operation.

**Relative Standard
Deviation.** Enter the minimum relative standard deviation to use in
determining invariant variables. If a variables relative standard deviation
is less than or equal to the number entered here, the variable will be
removed from the data set. Relative standard deviation is calculated as
the standard deviation divided by its mean (SD/X-bar).

**Use Caseweights.**
Select this check box to use the currently assigned spreadsheet case weights
in determining invariant variables. When this check box is selected, values
of the case weight variable specified in the Spreadsheet Case Weights
dialog box will be used as case multipliers before the invariant data
processing is applied. If the check box is cleared, the assigned case
weight will be disregarded for this analysis. Note that when case weights
have not been assigned, this option is not available.

**Output. **Use the options in this group box to
specify whether a new spreadsheet will be created and which variables
(from the original data set) should be included in it. Note that when
new spreadsheets are created, they will contain all variable properties
of the parent spreadsheet, e.g., variable header formats, display formats,
measurement types, etc. For more information on variable properties, see
the variable specification dialog box topic.

**Variables.**
Click the *Variables* button to display a standard variable selection
dialog box used to select variables in the input spreadsheet that will
be included in the output (filtered) spreadsheet.

**Create new spreadsheet.** When this
check box is selected, Statistica creates a new spreadsheet that contains
only the filtered data. If this check box is cleared, then invariant variables
will be removed from the input spreadsheet.

**Copy formatting.**
Select the *Copy formatting* check box to use the spreadsheet formats
(e.g., cell formatting, variable header formatting, or even __Spreadsheet
Layouts__) of the input spreadsheet in the output spreadsheet.
When this check box is cleared, formatting in the input spreadsheet will
not be copied to the new spreadsheet.

**OK.** Click the *OK* button to accept the
options specified here and remove invariant variables from the current
spreadsheet.

**Cancel.** Click the *Cancel button
*to close this dialog without removing invariant variables from
the current spreadsheet.