To combine trend analysis and decompositionmain topic see also
To combine trend analysis and decomposition1 Perform a Trend Analysis and store the fits, residuals, and forecasts (see Example of a trend analysis).
2 Choose Stat > Time Series > Decomposition.
3 In Variable, enter the column containing trend analysis residuals.
4 Under Model Type, choose Additive.
5 Under Model Components, choose Seasonal only.
6 Click Storage and check Fits. Click OK in each dialog box.
7 Next, you need to calculate the fits from the combined procedure. If you want these components to be additive, add the respective fits together.
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Note |
The MAPE, MAD, MSD accuracy measures from decomposition used in this manner are not comparable to these statistics calculated from other procedures, but you can calculate the comparable values fairly easily. We demonstrate this with MSD in the decomposition example. |