Poll Average Details- PA US Senate - 2010-11-02 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.

Poll	Mid Date	Time Weight	Internal	Pat Toomey Pat Toomey	Joseph A. Sestak Joseph A. Sestak
YouGov	10/31	X 1.00000		47.6000 - 0.0288 bias	43.5000 - 1.4134 bias
Public Policy Polling	10/31	X 1.00000		51.0000 - -0.1800 bias	46.0000 - 1.1680 bias
Muhlenberg College	10/31	X 1.00000		48.0000 - 1.6290 bias	44.0000 - -0.6942 bias
Quinnipiac University	10/30	X 0.98333		50.0000 - -0.2682 bias	45.0000 - 1.0754 bias
Marist Institute	10/28	X 0.95000		52.0000 - -0.4397 bias	45.0000 - 0.7635 bias
Rasmussen Reports	10/28	X 0.95000		50.0000 - 1.5977 bias	46.0000 - 0.4180 bias
Susquehanna Polling & Research (SP&R)	10/27	X 0.93333		46.0000 - -1.1849 bias	44.0000 - 1.4286 bias
Opinion Research Corporation (CNN)	10/26	X 0.91667		49.0000 - 0.4312 bias	45.0000 - 0.8608 bias
Franklin & Marshall College	10/24	X 0.88333		48.0000 - -0.8927 bias	40.0000 - 0.8112 bias
Ipsos-Public Affairs	10/24	X 0.88333		46.0000 - -21.0260 bias	46.0000 - -19.3724 bias
Garin-Hart-Yang Research (D)	10/10	X 0.65000		44.0000 - -2.3099 bias	47.0000 - 2.7672 bias
ccAdvertising (R)	10/7	X 0.60000		47.7400 - 4.4041 bias	40.1800 - -1.7906 bias
Bennett, Petts & Normington (D)	10/6	X 0.58333	X 1/2	46.0000 - -3.6705 bias	45.0000 - 4.9012 bias
Suffolk University	9/27	X 0.43333		45.0000 - -2.1317 bias	40.0000 - 1.6356 bias
Magellan Data & Mapping Strategies (R)	9/21	X 0.33333		49.4000 - 0.4956 bias	40.6000 - -0.5207 bias
Pulse Opinion Research	9/18	X 0.28333		48.0000 - 1.6194 bias	40.0000 - -0.2544 bias
Municipoll Research	9/16	X 0.25000		45.0000 - 0.8419 bias	36.0000 - 0.4551 bias
Critical Insights	9/16	X 0.25000		40.0000 - -1.3481 bias	36.0000 - 2.6037 bias
TOTAL				50.638027	45.642783