The PollyVote is based on the principle of combining forecasts. That is, PollyVote combines forecasts from different forecasting methods, the so-called component methods, each of which rely on different data. The PollyVote forecast is calculated by following a two-step approach. First, we average forecasts within each component method. Second, we average the resulting forecasts across the component methods. In other words, we use equal weighting of all forecasts within each component method, then equal weighting across these forecasts from different methods.