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Smoothing constraints ensure that changes in product values from period to period are within acceptable levels. They are sometimes used in place of the more restrictive non-declining yield constraints.
The user can add smoothing constraints to a model by specifying the Period Range that the smoothing constraint is to apply for, the Croptype Range, the Age Range and the Product Type.
The LOG 2.0 smoothing constraint window is shown below.
This option specifies what periods the constraint is to apply. Checking the box All will mean that the constraint will apply for all periods. Alternatively, a period range can be entered by entering the first and last periods in the two boxes below.
Depending on what is selected in the Category field, a range of croptypes or attribute names will be available in the Croptype Range list. Using the mouse, highlight the desired croptype ranges for which the current clearfell specification is to apply. To select consecutive items in the list, click the first item, press and hold down the [SHIFT] key and click the last item. To select non-consecutive items, press and hold [CTRL] and click each item.
The age range defines the range of age classes for which the particular constraint will apply.
To specify all age classes, simply ensure that the All Ages box is checked. Note that LOG will check this box automatically.
To specify a range of age classes, ensure that the All Ages box is not checked and enter the first and last age classes in the boxes provided below.
Selects whether yield, area, revenue or cost is smoothed.
The maximum increase and decrease smoothing levels can be specified as percentage values.
The maximum increase and decrease smoothing levels can be specified as absolute values.
The latest version of LOG now includes error checks on all inputs. This means that all fields need to have appropriate entries before the addition to the model is added. If there is something missing, or something in the wrong form, then a message is shown that prompts the user to remedy the situation.
Other Changes to the LOG 2.0 Smoothing Constraints*
Users of version 1.01 would have found that the smoothing constraints did not give accurate results. The As Value and As Percentage options for smoothing constraints in LOG 2.0 now work as intended.