For HuffPost, that means the model looks for trends in the polls and produces its best estimate of the polling average. The HuffPost Pollster charts for this year’s general election contests estimate the “average” of publicly available polls that meet our criteria for quality polling. The approach of the November election brings with it an endless tide of new polling data, which The Huffington Post uses to calculate who’s ahead in the big races. The HuffPost trend line will favor Clinton when the polls have generally favored Clinton and the polls showing Trump ahead ― or within a couple of points ― appear to be deviations. The HuffPost model also weights polls by their sample size, because larger samples have smaller margins of error.

Source: Huffington Post September 09, 2016 21:45 UTC