Poll Average Details- Philadelphia Mayor - 2003-11-04 19:00:00

The Poll Average is a weighted and adjusted number.
[Mid Date Column] All times are calculated by the middle date of the poll if it spans multiple days.
A time window of 2 months prior to the most recent poll is used.
[Time Weight Column] Polls are weighted in the amount they contribute to the final results in a linear fashion in this time window - the newest poll has a weight of 1, a poll 30 days prior will have a weight of 0.5 and a poll 60 days out will have a weight of 0. If the same pollster has more than one poll in this time period, only the newest will be used.
[Internal Column] If a poll is marked as being an internal poll for one of the candidates, it's weight will be halved.
[Candidate Columns, Bias] OurCampaigns has calculated partisan bias figures for all Polling Firms based on data from final vote totals in races they have polled. These amounts are subtracted from the poll result - in the case the bias figure is negative it will effectively be added to the poll result and appear as two dashes (minus a negative = plus). [TOTAL Row] The adjusted weights are summed for each poll result and the adjusted poll results for each candidate are multiplied by the poll weight and then summed. Each candidate's poll sum is divided by their weight sum to give the total.

PollMid DateTime WeightInternal John F. Street Samuel P. "Sam" Katz John R. Staggs Write-In
Survey USA10/29X 1.00000   55.0000 - 0.4044 bias 41.0000 - 0.3780 bias    
Mason-Dixon10/26X 0.95000   46.0000 - 0.3444 bias 41.0000 - 0.8876 bias 1.0000 - 0.8543 bias  
Temple University10/15X 0.76667   48.0000 - -2.2111 bias 41.0000 - 1.6987 bias    
Keystone Poll9/30X 0.51667   42.0000 - 1.3565 bias 34.0000 - -1.2490 bias    
KYW Newsradio 10609/23X 0.40000   40.0000 - -11.8342 bias 46.0000 - 12.1521 bias    
TOTAL 49.044886 38.700253 0.145700 0.000000