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It is really amazing how little time series issues are relevant to our community :/
HI! Interesting approach. Why won't you rely on standard TRAMO/SEATS or Census-X11-X12-X13 approaches?
George, thanks for your suggestion. I've actually got new WB3.. yet it did not solve my problem. Workbench won't open an nb file or build the project. It seems from the searches I've done it might be a java problem or an "ant" problem yet it is...
@Sean, state space models in econometrics are almost entirely borrowed from control systems field so I'm reasonably sure that there should be a way to convert it to mathematica's state space model. Thanks for your tip, I'll try using ARProcess....