Download the file Movie Ratings (.csv) at the bottom of the page of chapter 2. You will note that a lot of the values a values are NaN (movies rated on a scale of 1-5; a blank means that person didn’t see that movie). for movie rating file open google and search for programmers guide to data mining then you will find a link guidetodatamining.com. and sub link of chapter 2. open the chapter 2 link and scroll down then you will find movie ratings link.open the file.
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