1. A method of predicting an event, comprising: receiving in the form of digital data an initial probability distribution representing possible outcomes of an event; receiving an input from each of plural different users, also in the form of digital data, each input representing a predicted outcome for the event; aggregating the inputs with the initial probability distribution to create a cumulative probability distribution based on the inputs, where the aggregating includes using a computer to automatically convert the inputs to at least one second probability distribution, and using a computer to combine the initial probability distribution with the at least one second probability distribution to create the cumulative probability distribution; and creating a display image that includes the cumulative probability distribution for the event.