Our model takes into account all available polls, with greater emphasis on more recent results. We do not rate or rank pollsters; all polls are weighted equally, with one exception: Roy Morgan. Although Roy Morgan is a legitimate research firm, it is our view that its polling methodology involves longer periods than other pollsters. As a result, Roy Morgan polls are weighted less heavily than others in our model (although, only by 25%). This is because Roy Morgan, in our view, doesn't capture rapid shifts in sentiments. If representatives from Roy Morgan wish to dispute this approach, they are welcome to contact Kiwi Polls, and we will consider their arguments. It is very common for models to weight pollsters based on their prior performance. Kiwi Polls is of the view that pollster ratings are a little problematic. For instance, US election models disfavoured some models entirely on the bias of partisan affiliation, sometimes not including them in models at all. If they had done so, they would have had more accurate results. House bias is a real thing in polling and should be considered, but subjectively rejecting some polls over others is problematic and should be done with care.