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lmac
Posts: 8
Posted 21:26 Mar 31, 2011 |

Hey all,

 

I was looking at the Predicted Rating Algorithm (slide 13) where I see the average rating showing up twice, once at the beginning and once during the summation calculation on top.

 

Is the first average rating just the overall average rating by u1?

 

I know that when doing the correlation coefficient between two users, we only look at items that are shared by both people, is this the same average rating that will be used for calculating the numerator?

 

Best Regards,

 

Long.

cysun
Posts: 2935
Posted 21:27 Mar 31, 2011 |

You are not supposed to ask these types of questions during a quiz.

lmac
Posts: 8
Posted 21:38 Mar 31, 2011 |

Oh...sorry.

 

Long.