Table 38.1 summarizes the statements and options that control the X12 procedure.
Table 38.1: X12 Syntax Summary
Description 
Statement 
Option 

Data Set Options 

Specifies the auxiliary data set 

Specifies the input data set 

Specifies the userdefined event definition data set 

Specifies regression and ARIMA information 

Outputs regression and ARIMA information 

Writes summary statistics to an output data set 

Writes table values to an output data set 

Appends forecasts to the OUTPUT OUT= data 
X11 or 

set 

Prefixes backcasts to the OUTPUT OUT= data set 

Display Control Options 

Suppresses all displayed output 

Specifies the plots to be displayed 

Specifies the type of spectral plot to be 

displayed 

Specifies the series for spectral analysis 

Displays automatic model information 

Specifies the number of lags in regARIMA 

model residuals ACF and PACF tables and plots 

Displays regARIMA model residuals 

information 

Displays the iterations history 

Displays information about restarted iterations 

Specifies the differencing used in the ARIMA model identification ACF and PACF tables and plots 

Specifies the seasonal differencing used in the ARIMA model identification ACF and PACF tables and plots 

Specifies the number of lags in ARIMA model 

identification ACF and PACF tables and plots 

Displays regression model parameter estimates 

Requests tables that are not displayed by 

default 

Specifies that the summary line not be 

displayed 

Date Information Options 

Specifies the date variable 

Specifies the date of the first observation 

Specifies the beginning or ending date or both of the subset 

Specifies the interval of the time series 

Specifies the interval of the time series 

Declaring the Role of Variables 

Specifies BYgroup processing 

Specifies identifying variables 

Specifies the variables to be seasonally adjusted 

Specifies the userdefined variables that are 

available for regression 

Controlling the Table Computations 

Suppresses trimming of leading and trailing missing values (if they exist) 

Transforms or prioradjusts the series 

Transforms or prioradjusts the series 

Adjusts the series by using a predefined 

adjustment variable 

Specifies the maximum number of iterations for estimating AR and MA parameters 

Specifies the convergence tolerance for 

nonlinear estimation 

Specifies the number of backcasts by which to extend the series for seasonal adjustment 

Specifies the number of forecasts by which to extend the series for seasonal adjustment 

Specifies that onestepahead forecasts be computed 

Specifying Outlier Detection Options 

Specifies automatic outlier detection 

Specifies the span for outlier detection 

Specifies the outlier types to be detected 

Specifies the critical values for outlier detection 

Specifies the critical values for AO outlier 

detection 

Specifies the critical values for LS outlier 

detection 

Specifies the critical values for TC outlier 

detection 

Specifying the Regression Model 

Specifies predefined regression variables 

Specifies userdefined regression variables 

Specifies userdefined regression variables 

Specifies user defined event regression 

variables 

Specifying the ARIMA Model 

Uses the X12ARIMA TRAMObased 

method to choose a model 

Chooses an X12ARIMA model 

from a set that you specify 

Specifies the ARIMA part of the model 

Specifying Automatic Model Detection 

Options 

Specifies the maximum orders of ARMA 

polynomials 

Specifies the maximum orders of differencing 

Specifies the fixed orders of differencing 

Suppresses fitting of a constant parameter 

Specifies the preference for balanced models 

Specifies HannanRissanen initial estimation 

Specifies default model acceptance based on LjungBox Q 

Specifies the acceptance value for LjungBox Q 

Specifies the percentage by which to 

reduce the outlier critical value 

Specifies the critical value for ARMA 

coefficients 

Model Diagnostics 

Examines the regARIMA model residuals 

Specifying Seasonal Adjustment Options 

Specifies seasonal adjustment 

Specifies the mode of seasonal adjustment 

decomposition 

Specifies the seasonal filter 

Specifies the sigma limits 

Specifies the Henderson trend filter 

Specifies the D11 calculation method 

Specifies the adjustment factors to remove 

from final seasonally adjusted series 

Specifies a method for reconciling the 

seasonally adjusted series to the 

original series 

Specifies that SEATS seasonal 

decomposition be output to a data set 