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Apr 6th 2008 3:05PM Actually, the study controls for all the variables you mention.
On page 5 there is an explanation of control for "regional fixed effects" such as variation in "style" of play and possible bias of referees toward certain regions.
As for diving, the authors concede that there are some "non-violent" yellow cards, but the vast majority are given for flagrant physical fouls.
Feb 11th 2008 4:43PM The country is spelled Colombia. Just got back from a three week trip from there, couldn't have had a better time. Travelers I met doing the South American tour found Colombian cities to feel the safest on the continent.
Feb 20th 2006 11:53PM I'll be flying to Tunis Thurseday for a month, including a trip down to the star wars sites. My blog at www.jweinberg.net will have updates for the trip through Tunisia as well as subsuquent travel through Italy, Greece, Turkey, Bulgaria and Romania.