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Based on the definition of supporting degree,
we put forward the definitions of average index-supporting degree
and average dispersion, and we build an optimal combination
forecasting model based on exponential supporting degree. We also
give its equivalent average dispersion optimal combination
forecasting model. We propose the conception of superior combination
forecasting, we obtain the results, including the sufficient
conditions for the existing non-inferior and superior combination
forecasting, redundant forecasting and the redundant information
determination. Finally, we give the example to show that the model
is effective.