Publication date: 04/12/2021

This section provides details about the reports obtained from the three decomposition options:

Contains the values of β0 and β1 from the linear regression model that is fit to the data:

The detrended series is equal to Dt = Ot - Trendt, where Ot is the original time series.

Contains the values of the cyclical component that is fit to the data:

The parameter values are defined as follows:

• C is the (optional) Constant

• A is the Amplitude of the cosine wave

• U is the number of Units per Cycle

• P is the Phase of the cosine wave

• t is one less than the row number of a given observation

The decycled series is equal to Dt = Ot - Cyclet, where Ot is the original time series.

Depending on your selection of Decomposition Type, the X11 option adds an X11 - Multiplicative report or an X11 - Additive report. The reports contain the same four plots:

Original and Adjusted

Overlays the X11-adjusted time series on the original time series, Ot. The X11-adjusted values are Ot/St for the multiplicative adjustment and Ot - St for the additive adjustment.

D10 - Final Seasonal Factors

Plots the seasonal factor components, St, over time.

D12 - Final Trend Cycle

Plots the trend cycle components, Ct, over time.

D13 - Final Irregular Series

Plots the irregular components, It, over time.

The X11 reports have the following red triangle options:

Show Tables

Shows or hides the X11 summary tables, as described in Shiskin et. al. (1967). The tables are grouped into five categories (labeled B through F), described in Table 18.1.

Save Columns

Saves four columns to the data table: the seasonally adjusted time series, the seasonal components (St), the trend cycle components (Ct), and the irregular series components (It).

Save All Columns

Saves columns to the data table for all of the tables produced in the report by the Show Tables option.

Remove Fit

Removes the X11 report from the report window.

Letter Prefix |
Category Description |
---|---|

B |
preliminary estimates of seasonal, trend cycle, and irregular components |

C |
intermediate estimates of seasonal, trend cycle, and irregular components |

D |
final estimates of seasonal, trend cycle, and irregular components |

E |
analytical tables |

F |
summary measures |

For more information about the contents of the X11 output tables, see Shisken et. al. (1967) or SAS/ETS 15.2 User’s Guide (search for “The output from PROC X11”).

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