From time to time, on a forum someone will ask about shooting problems that they're having, and someone will post this chart, or one like it:
It's fine for what it is, but realize that
a) It was made for shooters shooting one handed bullseye style
b) There can be many causes for shooting errors in any given direction, so don't take the chart as gospel.
I like this one better: (seen on ar15.com at http://www.ar15.com/forums/topic.html?b=5&f=13&t=109634