https://communities.sas.com/t5/Mathematical-Optimization/Dynamic-Regressors/m-p/2702#M17 I spoke with ETS group: <BR /> "... refer to the PROC ARIMA chapter in the SAS/ETS Users Guide. It explains this in great detail." Fri, 06 Apr 2007 15:14:42 GMT Matthew_Galati 2007-04-06T15:14:42Z https://communities.sas.com/t5/Mathematical-Optimization/Dynamic-Regressors/m-p/2700#M15 Hi,<BR /> <BR /> I´m not sure that I´m right here but I´m trying to find out how dynamic regressors parameters in SAS/ETS relate to the classical formula of dynamic regression and how SAS/ETS is calculating dynamic regressiors generally. I mean is there prewhiteting being used or Linear Transfer Function? If anyone has an idea where I can find some relevant information I´ll be very grateful.<BR /> <BR /> Thanks. Wed, 04 Apr 2007 22:08:22 GMT https://communities.sas.com/t5/Mathematical-Optimization/Dynamic-Regressors/m-p/2700#M15 deleted_user 2007-04-04T22:08:22Z https://communities.sas.com/t5/Mathematical-Optimization/Dynamic-Regressors/m-p/2701#M16 This seems like a question best answered by the ETS folks. I have fwd'd your note along to someone in that department. Fri, 06 Apr 2007 13:37:54 GMT https://communities.sas.com/t5/Mathematical-Optimization/Dynamic-Regressors/m-p/2701#M16 Matthew_Galati 2007-04-06T13:37:54Z https://communities.sas.com/t5/Mathematical-Optimization/Dynamic-Regressors/m-p/2702#M17 I spoke with ETS group: <BR /> "... refer to the PROC ARIMA chapter in the SAS/ETS Users Guide. It explains this in great detail." Fri, 06 Apr 2007 15:14:42 GMT https://communities.sas.com/t5/Mathematical-Optimization/Dynamic-Regressors/m-p/2702#M17 Matthew_Galati 2007-04-06T15:14:42Z