Help using Base SAS procedures

discrepancy between ARIMA procedure and time series forcasting system (TSFS

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discrepancy between ARIMA procedure and time series forcasting system (TSFS

hello, I'm a french student so excuse-me for my englisch !

I use SAS for forecasting time series, I work on TSFS and the ARIMA procedure together, and I am extremely confuse because when I estimate parameters with the TSFS, I found somme results which are significants, but when I estimate the same model with le ARIMA procedure (with the same data of course) I found another parameters which are not significants .....

it's also more complicated because for ARIMA model like (0,1,1) and (4,1,0) the results of the parameters estimation are the same but not with a model like (3,0,3) or (2,1,2), and when I try the same forecast with an another variable I found unchanged estimation of prameters between TSFS and ARIMA procedure

Can somebody help me ?
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