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From |
"Kieran McCaul" <Kieran.McCaul@uwa.edu.au> |

To |
<statalist@hsphsun2.harvard.edu> |

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

Date |
Fri, 29 May 2009 07:26:18 +0800 |

.. 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/

**References**:**st: [clustered] random draws***From:*"Susan Olivia" <olivia@primal.ucdavis.edu>

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