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Our current society is filled with various types of rating systems. Some are ratings by experts or users of products and services. Consumer Reports is a well-known example of this. Online retailers like Amazon and Walmart have user-ratings to accompany almost every product they sell. Online forums where individuals can post their opinions or advice are also rated so you obtain the highest rated posts at the top, eg Stackoverflow. Ratings for larger institutions also exist, such as for hospitals and universities. Usually these are provided by experts with contributions from ordinary users. Others are ratings for entire countries, such as Freedom House.
Here we will take a look at a few of these.