Abstract:Hydrological time series are often asymmetric in time, insomuch as rises are more rapid than recessions, as well as having highly skewed marginal distributions. A two‐stage transformation is proposed for deseasonalized series. Rises are stretched, and recessions are squashed until the series is symmetric over time. An autoregressive moving average (ARMA) model is then fitted to the natural logarithms of this new series. The residuals from the ARMA model are represented by a double mixture of Weibull and expone… Show more
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