1. A non-transitory computer-readable medium storing computer-executable process steps for forecasting information, said process steps comprising: obtaining data that has been provided by each of a plurality of individual people; dividing the people into clusters by utilizing a statistical clustering technique; calculating statistics of the data in each of a plurality of the clusters; and combining the statistics for the plurality of the clusters so as to obtain a combination forecast, wherein said statistics include a cluster statistic for each corresponding cluster, wherein each said cluster statistic, for a particular cluster, is weighted based on at least one of dispersion within said particular cluster or historical accuracy of said particular cluster, and wherein said cluster statistics are combined using said weightings to produce the combination forecast.