Model Method - Rotation

The rotation method implements logic to take historical data as input and rotate the data onto the forecast period calendar. The input data are first aligned with the forecast period calendar with respect to Day Type, and then distributed over the specified forecast period. In this method, a separate Day Type is defined for each day of the week (i.e. Monday through Sunday), as well as for each holiday specified in the assigned Holiday Set.

The rotation specification options are:

• Data Start. Date of earliest data to use in the algorithm. Data before this date will be ignored. If blank, the start date is the earliest reading date for the Meter or Meter Group that is used as the Data Source for the model.
• Use Most Recent Days Only. If this checkbox is checked, the Rotation algorithm will use only the most recent days as specified in the Days field.
• Days. The number of days to use when the Use Most Recent Days Only field is checked.
• Rot. Exclude Load Control Data. If this is checked, data marked as Load Control will not be rotated forward.
• Rot. Exclude Load Event Data. If this is checked, data marked as Load Event will not be rotated forward.

For a specific forecast day, the rotation method finds the most recent historical day that is the same day of the week and has complete data. If a holiday set is assigned and the forecast day is a holiday, the method looks back in prior years for a holiday of the same type. If the prior holiday cannot be found within the search range, data for the most recent Sunday are used.