: Techniques of numerosity reduction can indeed be applied for reduce the data volume by choosing alternative, Ã¢â‚¬ËœsmallerÃ¢â‚¬â„¢ forms of data representation purpose. These techniques may be parametric or nonparametric. For parametric methods, a model is used to estimate the data, so that typically only the data parameters need to be stored, instead of the actual data. (Outliers may also be stored.) Log-linear models, which estimate discrete multidimensional probability distributions, are an example.
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