There's a grim but interesting study of suicide rates on the Bloor  
Viaduct in Toronto before and after the placement of a suicide 
prevention barrier. Lots of statistics to crunch.

Full text of the article available at:

http://www.bmj.com/cgi/reprint/341/jul06_1/c2884

As is characteristic of natural experiments, the results do not 
lead to any conclusion with confidence. Don't miss the 
thoughtful commentary contributed by Isaac Sakinofsky as a 
rapid response at 
http://www.bmj.com/cgi/eletters/341/jul06_1/c2884#238506 )

Sinyor, M. and Levitt, A. (2010). Effect of a barrier at Bloor 
Street Viaduct on suicide rates in Toronto: natural experiment. 
BMJ 2010;341:c2884 

Stephen
--------------------------------------------
Stephen L. Black, Ph.D.          
Professor of Psychology, Emeritus   
Bishop's University               
e-mail:  sblack at ubishops.ca
2600 College St.
Sherbrooke QC  J1M 1Z7
Canada
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