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A trend can mean the decreasing value of a function of time, i.e. f(t+dt) - f(t) < 0.

It can also mean a negative slope, i.e., df/dt < 0.

It may come up in statistics, economics (Stock Market) or Biology (population size) but could be used anywhere.

Sometimes a trend line is some kind of average taken over a time window. It could be the maximal decrease of local maxima, or it could be the average decline over a window of time.

<Feb 18, 2014 - B.C.>

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