Poll Average Details- PA US Senate - 2006-11-07 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	Bob Casey Jr. Bob Casey Jr.	Rick Santorum Scattering	Unidentified Scattering
Polimetrix	11/5	X 1.00000		56.0000 - 1.9452 bias	40.0000 - 1.6909 bias
McCulloch Research and Polling	11/5	X 1.00000		48.1000 - -4.9750 bias	44.1000 - 5.0153 bias
Strategic Vision (R)	11/4	X 0.98333		52.0000 - -0.4798 bias	40.0000 - 1.1151 bias
Mason-Dixon	11/3	X 0.96667		52.0000 - 0.4277 bias	39.0000 - 0.8543 bias
Muhlenberg College	11/1	X 0.93333		51.0000 - -0.6942 bias	43.0000 - 1.6290 bias
Reuters/Zogby	10/31	X 0.91667		48.0000 - 1.3729 bias	40.0000 - 0.1506 bias
Quinnipiac University	10/29	X 0.88333		52.0000 - 1.0754 bias	42.0000 - -0.2682 bias
Franklin & Marshall College	10/29	X 0.88333		53.0000 - 0.8112 bias	38.0000 - -0.8927 bias
Rasmussen Reports	10/28	X 0.86667		55.0000 - 0.4180 bias	42.0000 - 1.5977 bias
Zogby Interactive	10/27	X 0.85000		52.7000 - 0.0637 bias	43.8000 - 0.8374 bias
West Chester University	10/25	X 0.81667		50.0000 - 0.4137 bias	39.0000 - 0.3032 bias
Temple University	10/25	X 0.81667		54.0000 - -2.2111 bias	38.0000 - 1.6987 bias
the polling company™ (R)	9/28	X 0.36667		52.0000 - -0.1545 bias	36.0000 - 1.2390 bias
Pew Research	9/21	X 0.25000		47.0000 - 1.4784 bias	28.0000 - -1.7614 bias
Keystone Poll	9/18	X 0.20000		46.0000 - 1.5413 bias	41.0000 - -1.1791 bias
TOTAL				51.861052	39.267812	0.000000