Try Google Analytics. You can also link your Adsense in and get more detailed (albeit not as accurate) reports on earnings as they relate to a number of parameters (traffic sources included)
i am not familier with google analytics! its looking very difficult to understand. And there is another option added Customizing report. this making me confuse. any other freeware software of site provides the same facility with easier to use.
It's not "easy" because it's very all-encompassing. Maybe if you explained what you are looking to do with these analyses it would help people recommend something. Analytics works quite well for me.