i want to make rating system for my website using codeigniter and MySQL. Can any one tell me how rating system works? what are the calculations in rating system?
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If you mean a star rating then you need to count the votes and the rating. A special case is when you get high votes or very few votes then the problem is how do you sort the votes. A solution would be to write an algorithm that can find wrong or illegal votes and compute a meaningful ranking. Here is an implementation of the Wilson intervall that solve this equation: Star rating, implementing Wilson score interval.