Poll Average Details- VA - District 05 - 2010-11-02 18:00:00

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 Robert Hurt Robert HurtTom Perriello Jeffrey Clark Write-In
Benenson Strategy Group (D)10/20X 1.00000  X 1/2 47.0000 - -1.2376 bias 46.0000 - 2.2630 bias 3.0000 - 3.1743 bias  
Roanoke College10/14X 0.90000   46.0000 - 0.3736 bias 40.0000 - -0.8388 bias 1.0000 - -0.6149 bias  
Survey USA10/11X 0.85000   52.0000 - 0.3321 bias 41.0000 - 0.6087 bias 4.0000 - 1.6199 bias  
Penn, Schoen & Berland Associates (D)9/30X 0.66667   45.0000 - -1.4053 bias 44.0000 - 3.5544 bias    
ccAdvertising (R)9/27X 0.61667   51.1100 - 4.4044 bias 34.7400 - -1.7909 bias    
Custom Strategic Research9/23X 0.55000   44.0000 - -0.8119 bias 43.0000 - 1.8758 bias 1.0000 - -0.9852 bias  
Global Strategy Group (D)8/26X 0.08333   44.0000 - -2.0216 bias 42.0000 - 2.9243 bias 6.0000 - -6.7354 bias  
TOTAL 47.356946 40.397224 1.922250 0.000000