Fusioncode said:
That NPD uses the same methodology as VGC. |
Apologies I thought this was general knowledge, maybe I should have outlined it more in the OP.
VGC: http://www.vgchartz.com/methodology.php
NPD: NPD market research is based on responses from nationally representative samples. Our Research Science team’s extensive expertise in sampling and weighting techniques ensures return samples are demographically balanced to reflect the total population.
VGC uses slightly different language to say the same thing - that is that the majority of their data set is retail and user-polled data that is extrapolated based on an understanding of the historical trends in market size. The reason that NPD is held to be more accurate is that it has a (substantially) larger sample size, meaning that using the same tecniques, they'll normally (but statistically, not always) arrive at more accurate 'guesses.'
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