Question: The green trend line can be specified as hat ( y ) t = b + b 1 t + b 2 t 2 b

The green trend line can be specified as hat(y)t=b+b1t+b2t2
b20
There is one change in direction of the time series.
A linear trend line will under-forecast future values.
The green trend line can be specified as hat(y)t=b+b1t+b2t2 b20 There

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