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From |
"Susan Olivia" <olivia@primal.ucdavis.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: Fwd: st: RE: [clustered] random draws |

Date |
Thu, 28 May 2009 18:34:19 -0700 |

Thanks heaps Kieran for the programming tips. The code is doing what I after. Cheers, Susan > ---------- Forwarded message ---------- > From: Kieran McCaul <Kieran.McCaul@uwa.edu.au> > Date: Thu, May 28, 2009 at 4:26 PM > Subject: st: RE: [clustered] random draws > To: statalist@hsphsun2.harvard.edu > > > . > > > How about something like this. It creates 10 clusters. > I've left the sd's set at 5, but you could change these to > affect the degree of clustering. > > > > set seed 1234 > > forvalues i = 1/10 { > clear > local m1 = uniform()*100 > local m2 = uniform()*100 > > matrix m = (`m1',`m2') > matrix sd = (5,5) > drawnorm x y, n(10) means(m) sds(sd) > > tempfile ttt`i' > save ttt`i', replace > > } > > > use ttt1, clear > forvalues i = 2/5 { > append using ttt`i' > } > drop if x<0 | x>100 > drop if y<0 | y>100 > > scatter y x > > > > ______________________________________________ > Kieran McCaul MPH PhD > WA Centre for Health & Ageing (M573) > University of Western Australia > Level 6, Ainslie House > 48 Murray St > Perth 6000 > Phone: (08) 9224-2701 > Fax: (08) 9224 8009 > email: Kieran.McCaul@uwa.edu.au > http://myprofile.cos.com/mccaul > http://www.researcherid.com/rid/B-8751-2008 > ______________________________________________ > Man is a credulous animal, and must believe something; in > the absence of good grounds for belief, > he will be satisfied with bad ones. Bertrand Russell > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of > Susan Olivia Sent: Friday, 29 May 2009 6:17 AM > To: statalist@hsphsun2.harvard.edu > Subject: st: [clustered] random draws > > Dear Stata lister, > > I am generating x and y coordinates based on random draws > from a uniform distribution with a minimum value of 0 and > maximum value of 100 - which has the effect of randomly > locating the data in a 100 by 100 square. > > The question that I want to ask: I would like generate > clustered pattern from the generated x and y coordinates > [say 10 observations that close to each other forming a > cluster]. Is this something possible that I can do in > Stata? > > Thanks in advance, > > Susan > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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