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 !
