X-11/Y2k Monthly Seasonal Adjustment (Census Method II) - Extremes Tab

Select the Extremes tab of the X-11/Y2k Monthly Seasonal Adjustment (Census Method II) dialog box to access the option described here.

Element Name	Description
Sigma limits for graduating extreme values	One of the strengths of the X-11 method is in the treatment of outliers. When estimating the seasonal and trend-cycle components, irregular values are assigned different weights depending on their deviation from 0 (zero; additive model) or 1 (multiplicative model). See also X-11 result tables (table B 4) for details concerning this procedure.
Full weight	The Full weight value determines the multiple of σ (Sigma; the estimate of the trend-cycle standard deviation) below which a value will be assigned a full weight.
Zero weight	The Zero weight value determines the multiple of σ above which a zero weight will be assigned. Between these two cut-off values, linearly graduated weights are assigned.