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The question is :How do you decidehow well data represents a population?
I don't get it!!!!!!!
as categorily distributed as in the population.
For example, male:female=100:105
kids:whole=1/10 or something.
And, sufficiantly large sample, better at least 35 for each category, so your overall data might contain hundreds of samples.
X'(y-Xβ)=0
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