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kirby007 said:
Torillian said:


This is because of a shift in what weeks the two posters are looking at.  Kitler starts with 4 weeks beginning at the week ending April 6th and going to April 26th.  Boutros is doing four weeks beginning at the week ending April 13 and going to May 3rd.

 

I don't know which is correct for NPD as I don't know enough about NPD to say that, but that's the reasoning for the differences in totals between the two.  

I just realised that Boutros has done this for ages thus we can safely assume the weeks he shows are the right ones

Here's how the covered periods are determined:

https://docs.google.com/spreadsheet/ccc?key=0AtXhc02VTSWzdFQ4ejJFMUtXdXlpM3NrREg3Z1c5eFE#gid=0