Poll Average Details- London Mayor - 2016-05-05 16:00:00

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 Sadiq Khan Zac Goldsmith Caroline Pidgeon Siân Berry Peter Whittle Sophie Walker George Galloway Paul Golding Lee Harris David Furness Janek Zylinski Ankit Love
YouGov5/4X 1.00000   43.0000 - -1.8300 bias 32.0000 - 0.2782 bias 6.0000 - 0.7780 bias 7.0000 - 0.5054 bias 7.0000 - 0.3450 bias 2.0000 - 0.1340 bias 1.0000 - -0.1115 bias 1.0000 - -0.1034 bias 1.0000 - 0.2777 bias      
Opinium5/1X 0.95000   35.0000 - 3.9159 bias 26.0000 - 0.6219 bias 4.0000 - -1.9119 bias 4.0000 - -0.6355 bias 4.0000 - 1.1836 bias              
Survation4/25X 0.85000   49.0000 - 2.8386 bias 34.0000 - -0.3295 bias 3.0000 - -1.0722 bias 3.0000 - -2.2067 bias 5.0000 - 0.2531 bias   2.0000 - 0.3747 bias          
Savanta ComRes4/3X 0.48333   44.0000 - 3.6627 bias 37.0000 - 0.6659 bias 7.0000 - 0.2514 bias 4.0000 - 0.5445 bias 5.0000 - 0.1396 bias   2.0000 - 0.7186 bias          
TOTAL 40.536075 31.240371 5.348680 5.175892 4.786184 1.866000 1.333864 1.103400 0.722300 0.000000 0.000000 0.000000