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    How to calculate general trendline for a time series

    Hi there, Given a time series with data points x_1, x_2, x_3,...,x_n I want to be able to extrapolate its future behaviour. I can see three options: \sum_i (x_(i+1)-x_i)/x_i count of how many terms of (x_(i+1)-x_i) are positive and negative Assume linearity and calculate m for the best...