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Holt-Winters (Time Series)
SynopsisThis operator trains an Holt-Winters forecasting model with triple exponential smoothing.
The Holt-Winters forecasting method applies a triple exponential smoothing for level, trend and seasonal components.
A Holt-Winters model is defined by its three order parameters, alpha, beta, gamma. Alpha specifies the coefficient for the level smoothing. Beta specifies the coefficient for the trend smoothing. Gamma specifies the coefficient for the seasonal smoothing. There is also a parameter for the type of seasonality: Additive seasonality, where each season changes by a constant number. Multiplicative seasonality, where each season changes by a factor.
This operator works only on numerical time series.
This operator is similar to other modeling operators, but is specifically designed to work on time series data. One of the implications of this is, that the forecast model should be applied on the same data it was trained on.
This operator receives a trained Holt-Winters model and create the forecast for the time series it was trained on.
- example set (IOObject)
The ExampleSet which contains the time series data as an attribute.
- forecast model (IOObject)
The Holt-Winters model (forecast model) fitted to the specified time series attribute. It also contains the original time series values.
- original (IOObject)
The ExampleSet that was given as input is passed through without changes.
The time series attribute (numerical) for which the Holt-Winters model should be build. The required attribute can be selected from this option. The attribute name can be selected from the drop down box of the parameter if the meta data is known.Range:
This parameter indicates if there is an index attribute associated with the time series. If this parameter is set to true, the index attribute has to be selected.Range:
If the parameter has indices is set to true, this parameter defines the associated index attribute. It can be either a date, date_time or numeric value type attribute. The attribute name can be selected from the drop down box of the parameter if the meta data is known.Range:
The parameter alpha specifies the coefficient for the level smoothing.Range:
The parameter beta specifies the coefficient for the trend smoothing.Range:
The parameter gamma specifies the coefficient for the seasonal smoothing.Range:
This parameter specifies the length of one seasonal period in the data. For weekly data this is often 7, for monthly data 12. The period has to be smaller or equal to half of the length of the time series.Range:
This parameter specifies the type of seasonality.
- additive: Additive seasonality, where each season changes by a constant number.
- multiplicative: Multiplicative seasonality, where each season changes by a factor.
Holt-Winters on monthly milk production
This tutorial process shows the basic usage of the Holt-Winters operator, by training a Holt-Winters model on the Monthly Milk Production data.