Yvette wrote:

>Prediction Model using double exponential smoothing  to estimate the
>linear trend in prices (as originally reported) and extending the
>trend to future years.  The base period is about 8-10 years and a
>smoothing constant needs to be used to make the trend fairly
>responsive to change.  I'm not sure what this constant should be or
>how it is obtained.

Your textbook and your instructor should each have more meaningful hints 
to offer than we, the readers of this small amount of information.


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