Poll Average Details- MT US Senate - 2012-11-06 21:00:00

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	Dennis Rehberg Dennis Rehberg	Jon Tester Jon Tester	Dan Cox Jerry McConnell
Public Policy Polling	11/3	X 1.00000		46.0000 - -0.1800 bias	48.0000 - 1.1680 bias	4.0000 - 1.4191 bias
Mason-Dixon	10/31	X 0.95000		49.0000 - 0.8543 bias	45.0000 - 0.4277 bias	1.0000 - 0.2403 bias
Rasmussen Reports	10/29	X 0.91667		48.0000 - 1.5977 bias	49.0000 - 0.4180 bias
Pharos Research Group	10/28	X 0.90000		46.5000 - 1.0763 bias	48.2000 - 1.6664 bias
Montana State University Billings	9/30	X 0.43333		42.6000 - -1.1286 bias	39.7000 - 0.9098 bias	5.8000 - 0.5258 bias
Global Strategy Group (D)	9/25	X 0.35000		42.0000 - -2.0582 bias	44.0000 - 2.9065 bias	7.0000 - 2.6764 bias
TOTAL				46.088927	45.446426	2.598059