Date:         Tue, 11 Apr 2000 17:52:26 -0300
Reply-To:     Gonzalo Kmaid <gkmaid@INTERNET.COM.UY>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Gonzalo Kmaid <gkmaid@INTERNET.COM.UY>
Subject:      sampling proportionate to size
Comments: To: SPSSX-L@UGA.CC.UGA.EDU
Content-Type: text/plain; charset="iso-8859-1"

Hi All,

Here´s another sampling question. I have a data set of  n blocks that looks
like this:

blockid      persons  cumpop

1               110          110
2               120          230
3               320          550
4                 89          639
5                65           704
...
n


The number of persons living in each block varies a lot, so I want to get a
sample of blocks taking into account the size of the block (prob of block j
to be selected proportional to its weight in the cumulative pop figure).

I think Raynald posted some time ago a piece of syntax to do something
similar. TIA!!!!


Gonzalo Kmaid

..