I've got a website with voting system where people can vote a review either up or down. For example: “Did you find this review helpful? [Yes] or [No]?”
In order to order the reviews by how much they were appreciated I'd like a single number to order them by. Just using the percentage of up votes doesn't cut it because it doesn't take the total number of votes into account. A review with 2 up votes and 0 down votes (100%) should not be shown before a review with 95 up votes and 5 down votes (95%).
Any ideas on which formula to use? Thanks.