Time Series: Estimate trend of series from linear-, quadratic-trend models

Alex_Of_Darkness

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Nov 16, 2017
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Estimate, the trend of the series from a linear trend model and a quadratic model.
I usually know how to do it but it is simply not working, this is what I have but I know I'm wrong.

Linear => http://image.noelshack.com/fichiers/2017/48/2/1511895370-screen-shot-2017-11-28-at-13-55-25.png

Quadratic => http://image.noelshack.com/fichiers/2017/48/2/1511895353-screen-shot-2017-11-28-at-13-55-36.png

It's in french but it probably doesn't change anything if you know how it works! Would mean the world to me if someone can help me.
 
Fire up your favorite spreadsheet.

Yes, mathematics works in French.
 
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