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Building a Recommendation System with R by Suresh K. Gorakala

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Summary

This chapter showed you how to evaluate the performance of different models in order to choose the most accurate one. There are different ways to evaluate performances that might potentially lead to different choices. Depending on the business target, the evaluation metric is different. This is an example of how business and data should be combined to achieve the final result.

The next chapter will explain a complete use case in which we will prepare the data, build different models, and test them.

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