Poll Average Details- PA US President - D Primary - 2008-04-22 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	Hillary Clinton Hillary Clinton	Barack Obama Hillary Clinton	Others Hillary Clinton
Insider Advantage	4/22	X 1.00000		49.0000	42.0000
Zogby International	4/21	X 0.98333		51.0000	41.0000
Public Policy Polling	4/20	X 0.96667		46.0000	49.0000
Rasmussen Reports	4/20	X 0.96667		49.0000	44.0000
Suffolk University	4/20	X 0.96667		52.0000	42.0000
Quinnipiac University	4/20	X 0.96667		51.0000	44.0000
Survey USA	4/20	X 0.96667		50.0000	44.0000
Strategic Vision (R)	4/20	X 0.96667		48.0000	41.0000
American Research Group	4/19	X 0.95000		54.0000	41.0000
Mason-Dixon	4/18	X 0.93333		48.0000	43.0000
Los Angeles Times/Bloomberg	4/14	X 0.86667		46.0000	41.0000
Franklin & Marshall College	4/13	X 0.85000		49.0000	42.0000
Susquehanna Polling & Research (SP&R)	4/10	X 0.80000		40.0000	37.0000
Temple University	4/9	X 0.78333		47.0000	41.0000
TIME Poll - SRBI Public Affairs	4/6	X 0.73333		49.0000	41.0000
Muhlenberg College	4/2	X 0.66667		51.0000	41.0000
TOTAL				48.838747	42.247100	0.000000