X-11 Census Method II Seasonal Adjustment - Specific Description of all Result Tables Computed by the X-11 Method

In each part A through G of the analysis (see Results Tables Computed by the X-11 Method), different result tables are computed. Customarily, these tables are numbered, and also identified by a letter to indicate the respective part of the analysis. For example, table B 11 shows the initial seasonally adjusted series; C 11 is the refined seasonally adjusted series, and D 11 is the final seasonally adjusted series. Shown below is a list of all available tables. Those tables identified by an asterisk (*) are not available (applicable) when analyzing quarterly series. (Also, for quarterly adjustment, some of the computations outlined below are slightly different; for example instead of a 12-term [monthly] moving average, a 4-term [quarterly] moving average is applied to compute the seasonal factors; the initial trend-cycle estimate is computed via a centered 4-term moving average, the final trend-cycle estimate in each part is computed by a 5-term Henderson average.)

Following the convention of the Census Bureau version of the X-11 method, the STATISTICA implementation offers three levels of printout detail: Standard (17 to 27 tables), Long (27 to 39 tables), and Full (44 to 59 tables). An option to only produce selected tables is also provided (see the descriptions of the X-11 Monthly Seasonal Adjustment (Census Method II) and X-11 Quarterly Seasonal Adjustment (Census Method II) dialogs). In the description of each table below, the letters S, L, and F are used next to each title to indicate, which tables will be displayed and/or printed at the respective setting of the output option. (For the charts, two levels of detail are available: Standard and All.)

Click on the table name below to obtain more information about that table.

Tables B 14 through B 16, B18, and B19: Adjustment for trading-day variation

These tables are only available when analyzing monthly series. Different months contain different numbers of days of the week (i.e., Mondays, Tuesdays, etc.). In some series, the variation in the different numbers of trading-days may contribute significantly to monthly fluctuations (e.g., the monthly revenues of an amusement park will be greatly influenced by the number of Saturdays/Sundays in each month). You can specify initial weights for each trading-day (see A 4), and/or these weights can be estimated from the data (you can also choose to apply those weights conditionally, i.e., only if they explain a significant proportion of variance; see the description of the X-11 Monthly Seasonal Adjustment).

Tables C 14 through C 16, C 18, and C 19: Adjustment for trading-day variation

These tables are only available when analyzing monthly series, and when adjustment for trading-day variation is requested. In that case, the trading-day adjustment factors are computed from the refined adjusted series, analogous to the adjustment performed in part B (B 14 through B 16, B 18 and B 19).