@book{68977,
	author = {Hosmer, David W. and Lemeshow, Stanley},
	title = {Applied logistic regression},
	publisher = {Wiley},
	year = {2000},
	series = {Wiley series in probability and statistics.},
	address = {Nueva York (Estados Unidos)},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/toc/onix05/00036843.html}
}