Setting Up Seasonal Adjustment Parameters (X11)

1. Make sure that the side panel is displayed.

2. Select a series calculated by the Seasonal Adjustment (X11) method in the data table.

3. Select the Series radio button on the side panel.

4. Go to the Parameters tab.

Select a model, applied to adjust seasonal component of the source series, in the Seasonal Effect group of parameters:

• Additive. Default. The series is considered as a sum of systematic and irregular components.

• Multiplicative. The series is considered as a product of systematic and irregular components.

Working day adjustment is applied only for monthly data.

If working day adjustment is required:

1. Select the Working Day Adjustment checkbox.

2. Select adjustment type:

• Always. Working day adjustment is applied.

• Automatically. It is automatically determined whether working day adjustment should be done.

Holiday adjustment enables the user to increase calculation accuracy and is applied only for multiplicative model of seasonality calculated by monthly data.

If holiday adjustment is required:

1. Select the Holiday Adjustment checkbox.

2. Select adjustment type:

1. • Easter.

   • Easter, Labor Day, Thanksgiving Day.

   • Use Fisher Criterion.

Most of real time series include outliers. They can distort seasonality and trend estimations. The X11 method enables the user to reduce the outliers effect by excluding values outside the specified range from analysis or by transforming these values.

The width of the range is specified by the lower sigma border and the upper sigma border in the Sigma Limits section. By default, the lower limit is 1.5, and the upper limit is 2.5.

If the Sliding Spans checkbox is selected, the calculation uses sliding spans. The checkbox is deselected by default.

In the Save to Calculated Series group select the radio button next to the series name, which values will be contained in the output data series.

• Prior adjusted or source series (B01). Default.

• Seasonal component (D10).

• Seasonally adjusted series (D11).

• Trend-cycle component (D12).

• Irregular component (D13).