Yes for the recommender . I had a range from 0 to 1 and I mapped it using log which gives more range but in negative and this gives better precision results.
On Sat, Dec 15, 2012 at 9:33 AM, Sean Owen <[email protected]> wrote: > I assume you are talking about recommenders. For most everything you > see, range does not matter in the sense that there is not a better or > worse range to use. > > It will affect some results slightly. For example, doubling all your > numbers should double your RMSE evaluation scores of course. Shifting > your range would change an uncentered cosine similarity measure. > > Finally note that most approaches involve random sampling somewhere. > This can make for different results on different runs too. > > On Sat, Dec 15, 2012 at 3:10 PM, Zia mel <[email protected]> wrote: >> Hi >> >> Q1: If I have preferences that range from -1 to -5 with higher -1 and >> lower -5 is that fine or I need to make the preferences positive ? >> >> Q2: Does the range of preferences matter ? for examples is there >> difference if the preferences are between 0 to 1 or 0 to 5 ? According >> to a test I have done it seems yes, is that correct? Is there a >> prefered range of preferences ? >> >> Thanks !
