Note: All interactive graphics and the estimates of house effects are updated as new polls are published.
Developments since the Last General Election
This graph displays the 'house effects' of the polling companies for each party. A positive house effect means that a pollster structurally estimates a certain party higher than the average pollster. The dot indicates the best estimate for the house effect, the lines display the 95% uncertainty margin. Note that the x-axes are rescaled for each party to improve the interpretability of house effects.