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We have a homework problem dealing with regression and dummy variables using SPSS. Our question is to use dummy variables with linear trend-cycle, and than later try an non-linear trend cycle (we are also using holdback data). The data is in quarters as well.

I am doing the steps correct based off of lectures and notes, however, the standardized error that comes up seems off, as well as my ACF. below is the unstandardized error and ACF

I am now wondering if it is because I will need to de-seasonalize the data first? But I am confused on the steps on how to do that when using dummy variables.

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