I suggest that you ask SPSS to provide this useful report for you and others struggling with understanding the model in simple terms. This was obtained by multiplying through by the denominator structure for X where VAR1 is your APPLES. using data you had provided in ARIMA with independent variables I obtained for RHSIDE.TXT a presentation that expressed the forecast in terms of the Y and the one input and the history of errors. This is a unique feature and is referred to as RHSIDE.TXT for your second example.įor your first example. an explicit equation showing an understandable ( to the layman ) presentation. AUTOBOX takes the final model and expresses the forecast in "regression-like terms) i.e. One of the thorniest issues in transfer function modelling is the lack of clarity when the results are presented.
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