1870-3453 1870-3453 S1870-34532018000200412 10.22201/ib.20078706e.2018.2.2369 Mexico 00 00 2018 00 00 2018 89 2 412 420

1992 2008 3-32 2005 1877 1979 17 607-35 2007 14 8-16 2007 9 694-704 2012 19 133-9 1986 67 246-50 2004 91 1061-9 2004 91 1052-60 1984 21 315-29 R Development Core Team 2017 1997 29 298-308 1996 107 504-12 1989 26 1-102 1988 66 1421-4