David Clounch wrote:
> Miller/Freund: "A set of observations, X1, X2, ... ,Xn constitutes a
> random sample of size n from a finite population of size N if it is
> chosen so that each subset of n of the N elements of the population
> has the same probability of being selected."
>
>
> Ok, so, to me then, the idea that each event is equally likely is
> very much part of the idea of random.
>
David
Maybe I am misunderstanding what you are saying but
that is not how I would interpret the statement by Miller. I don't
think the probability of the different values of X1 etc are all equal.
Rather what he is getting at is that from all the ways of subsetting N
into a sample, each subset has an equal chance of being chosen to be the
one being evaluated ie nothing is filtering some observations out.
Dave W (CSCA member)
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Received on Mon Nov 26 14:31:54 2007
This archive was generated by hypermail 2.1.8 : Mon Nov 26 2007 - 14:31:54 EST