Window statement

 Window
   [Begin=begin_time]
   [End=end_time]
   [Range=trial_range]

Type conventions and statement syntax are explained in the Glossary.

By default, trial and case variables as well as data surfaces describe entire trials. You may, however, use this statement to set a time window before computing a data surface or before creating the data array(s) on which you want to base trial or case variables. This allows you, for example, to create variables that describe only the first ten seconds of each trial.

Parameters...

Begin
Number parameter indicating the begin of the time window. If Begin < End, Begin is interpreted as offset from the beginning of the trial. If Begin > End, Begin is interpreted as offset from the end of the trial. If no value is specified for this parameter, Wintrack will use the time window setting of the Analyze Case command to supplement a default value each time the custom variable definition file is processed.

End
Number parameter indicating the end of the time window. If Begin < End, End is interpreted as offset from the beginning of the trial. If Begin > End, End is interpreted as offset from the end of the trial. If no value is specified for this parameter, Wintrack will use the time window setting of the Analyze Case command to supplement a default value each time the custom variable definition file is processed.

Range
Range parameter indicating the range of trials that should be affected by the new window setting. If no trial range is specified, the window setting is applied to all trials.

Note that...

If the time window extends past the beginning or end of a trial, it is shrunken to fit. If both the beginning and end of the window lie either beyond the beginning or beyond the end of a trial, the variable will be assigned a missing value code for that trial. You can place Window statements anywhere in a custom variable definition file. Once you have set a time window, it will affect all subsequent Surface and Collapse statements and thus all data surfaces and data arrays created thereafter. You must execute another Window statement if you want new data surfaces or trial and case variables to refer to a different time window or again to entire trials.

Additional information...

• Managing custom variable definition files provides general information on the management of custom variable definition files.
• The Flowchart of advanced data analysis gives a synopsis of data and variable types.
• There is a topic describing how to build a custom variable definition file.
• There is a list of all available variable definition statements.
• See Analyze Case Document command for basic information on that command.
• Inside case documents provides advanced information on case documents.