X11 output B 19 - Original Series Adjusted for Trading-day and Prior Variation

The values in B 18 are used to adjust the original (adjusted) series (in A 1 , A 3 , or B 1 , depending on whether or not prior adjustment factors were specified). Specifically, the values in B 18 are subtracted from (additive model) or divided into (multiplicative model) the original series.
For more information, see X-11 Census Method II Seasonal Adjustment .