I was just speaking with Pezus through PM about being within 50k was reasonable and no reason to shout undertracked/overtracked on stuff like that and then i read this.
From ioi himself.
Oh man my head hurts reading this thread! I'd love to jump in and correct most of the idiotic comments and "analysis" in here but I don't think it is actually worth doing so since people just seem to want to believe what they want anyway and don't actually listen to logic or reason!
This post - http://gamrconnect.vgchartz.com/post.php?id=5909056 - is a good place for you all to start. After reading that, if you can articulate your concerns in a concise and factual manner I will try to reply to them as best I can...
To be honest I couldn't care less what IGN thinks - they won't be around in 5 years the way they are going so their opinion counts for nothing in my eyes. What does bother me is the ignorance of some people in this very thread who still don't get it!
Take the 600k figure as the midpoint with a decaying range of probability around it, much like a standard probability bell curve:
If we claim 600k for a game and NPD says 635k then are we "wrong"? If they say 485k are we "wrong"? Not in my eyes, we are within a reasonable and expected margin of error - we'd be in the fat part of that bell curve above - especially when you consider that NPDs data itself will carry a 10-15 error margin. This is why people who say that have overtracked something because we have 790k and NPD has 740k just annoys me! Their figure represents anything between 650k and 850k and our figure represents anything between 700k and 900k so they line up just fine. A 50k difference out of 800k is a tiny and insignificant difference.
You have to start thinking of a data estimate as being a range of possible data not just one hard, absolute figure. I can't emphasise that point enough.
Now if we said a game sold 1.2m and in fact it only sold 50k then that would clearly be outside of any reasonable margin of error and right at one of the extreme ends of that bell curve above - which would clearly be unacceptable.