2007-0934 2007-0934 S2007-09342018000601171 10.29312/remexca.v9i6.1582 Mexico Mexico Mexico 00 09 2018 00 09 2018 9 6 1171 1180

2001 47-56 1980 1 92 2004 201 2-3 2-3 145-60 2002 92 2007 1-7 1961 7 4 4 337-41 1884 147 2012 12 1 1 81-8 1995 8 2007 46 1991 634 1988 2nd 2006 Primera 37 Statistical Analysis System (SAS) 2004 2003 174 2010 33 4 4 343-51