The basic assumption with a trend analysis is that the picture of the present can be projected into the future.This is a bad assumption,because even if you have enough historical data,it is unproductive to assume.

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A trend analysis is a hypothetical extension of a past series of events into the future.The basic assumption is that the picture of the present can be projected into the future.This is not a bad assumption,if you have enough historical data,but it is always subject to surprises.

The Basic Assumption with a Trend Analysis Is That the Picture