Workfile Utility Functions
@dtoo Observation number in the workfile associated with a date string.
@ispanel Is the current workfile page panel structured.
@obsrange Number of observations in the workfile page .
@obssmpl Number of observations in the workfile sample.
@otod Workfile observation to date string.
@otods Sample observation to date string.
@pagefreq Frequency specification for the workfile page .
@pageids Workfile page observation identifiers.
@pageidx Index vector of the specified observations.
@pagerange Range specification of active workfile page.
@pagesmpl Sample specification in active workfile page.
@pagesmplidx Index vector of observations in the current sample.