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I am doing a project for my CS class and I was wondering if the following would work.

I have 50 different people who have rated the same 50 books. The rating system is as follows:

negative 5 = hate it

negative 3 = dislike it

0 = I have not read it

2 = It is ok

3 = I like it

5 = I love it

My question is as follows. Can I replace the numbers into letters and calculate the relative entropy between the users to find the similarity and produce the best match ? I don't know enough about relative entropy but from what I have read so far it seems to be ok to do so, but just wanted more clarification over it.

Thanks for help!

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