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what is the denominator in average rating of a user in Adjusted cosine similarity? (Item Based Collaborative Filtering)

Is it number all Items in system?? Or Just number of rated items by user??

and

is there a function in MatLab for Adjusted Cosine?

thanks

Anna
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1 Answers1

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Question 1: Is it number all Items in system?? Or Just number of rated items by user??

Answer 1: Neither

If you see this formula:

Adjusted Cosine

in the denominator you need to calculate the rooted sum for each Rating of user u for item i minus the average rating of this User (mean rating) and this subtraction is squared then it is the same thing for item j which you have to multiply together.

Question 2: is there a function in MatLab for Adjusted Cosine?

Answer 2: By default no. But it should be relatively easy to write it your self given that you have the formula.

Community
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nik peeth
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