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st: tolerance in spmat contiguity


From   Ajita Atreya <ajita63@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: tolerance in spmat contiguity
Date   Fri, 3 Feb 2012 17:00:41 +0000

Dear Statalist,
When creating a contiguity matrix (spmat contiguity...) I found there is an option called tolerance which can be used when determining whether units share a common border. 
The default value is 1e-7. 
Can anyone tell me what is the unit of tolerance. 
Can I set 200m as tolerance when working with contiguity matrix?
Thank YouAjita 		 	   		  
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