NJ5 on 16 January 2009
@mike_intellivision: One thing that I have always wondered about is how NPD's corrections are reflected in the data they publish.
There are two possibilities:
1- Corrections are done by adding or subtracting the correction amount from later months' numbers.
2- Corrections are simply not reflected in the published data.
In case 1, we can't trust the monthly data. In case 2, we can't trust neither the monthly data nor the accumulated data.
Either way, there's something we can't trust about NPD numbers. In both cases, we can't trust the monthly data.
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