# Need to find correlation between two entities

I have a scenario where I have a User which likes 10 different sports and there is another user which likes 20 different sports. I need to find the correlation between them. What kind of correlations can be used in such a scenario. Any kind of guide would be helpful. I tried with Pearson correlation but was not helpful. I would like to program using MATLAB. Thanks in advance.

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Exactly what do you plan to do with this correlation once you compute it? –  whuber Apr 26 '11 at 21:14
We would deduce whether the two users according to their sports interest are related or not. Something like If I like soccer and football, and some one likes just football, still we both are related by some percentage. So i want to calculate that percentage of similarity –  user4341 Apr 26 '11 at 21:24
Do you have a large matrix where rows are users and sports are columns and values are measures how much someone likes a sport? –  GaBorgulya Apr 26 '11 at 22:21
yes, i have a matrix for individual users where columns are different sports and the one they like have a value one. –  user4341 Apr 26 '11 at 23:12

The OP said the number of liked objects is not the same for the two raters. How would you apply Cohen's $\kappa$ in this case? –  chl Apr 27 '11 at 9:33
@chi I was thinking of the users each rating each of a few dozen sports as one of two levels (like or not). Does that answer your question? If not, I should probably review how Cohen's $\kappa$ works. –  Thomas Levine Apr 29 '11 at 20:21