DDSUM returns the sum of values of a daily detail variable in a specified range of hours.  The hour range is specified by StartHour and StopHour

SYNTAX:

DDSUM(Cx,StartHour,StopHour)
where :
Cx is a conditional variable x
StartHour defines the hour to start gathering data for the calculation, using a 24 hour time designation
StopHour defines the hour to stop gathering data, which includes data to the end of the specified hour

NOTES:

When more than 24 hours is specified, the result is stored on the date of the StartHour.

EXAMPLES:

V78 = (C72, 6, 14)  Returns the Sum of Variable C72 between 6:00 AM and 2:59 PM each day. (V78 is a daily variable)