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trunkswd said:

For our weekly estimates we use historical data and a small number of figures we get that we extrapolate to the entire market. As for what we use to make adjustments after the fact? Official reports from Nintendo, Sony, and Microsoft (when they still did it), as well as NPD, GfK, Famitsu, etc. 

Awesome, thank you very much for sharing. I have always been amazed at all your hard work in creating these weekly estimates. Adjustments don't seem to be too big.