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		| Diego Andres Perez  | 
	
	
		| Center for Mathematical Research | 
	
	
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		| Calz. Echegaray No. 15 Col. 10 de Abril Naucalpan | 
	
	
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		| Mexico, Mexico 53320 | 
	
	
		| Mexico | 
	
	
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		| dapr@cimat.mx | 
	
	
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		JEL Areas: C1 : Econometric and Statistical Methods: General C0 : Mathematical and Quantitative Methods: General |