Both extrapolate data based on a set of data points
It is not clear how many data points habe in th us But NPD has used 4500 inputs for the whole phone os representation Let me tell you that they wont use much more for the hardware and software data.. Npd gospel is based on familairity due to being the old establised order Which is not logical!
"I think people should define the word crap" - Kirby007
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