mjdans on 30 April 2009
I have re-read my post and it does not quite tell what i wanted to say if you get numbers from 50 retailers out of 5000 you can muiltipli by 100 or taking in to account retailer different market share.
you can use any other number that will give best est.
Or you can breakdown retailers in to groups to best mirror the market then work out how many retailers fit each group.
Both will give you end numbers both are est. only.
so how you refine your numbers is up to you some will be better than others all are still est. also time of year could change how you go about it.
