0034-7744 0034-7744 S0034-77442015000600339 Argentina Argentina Argentina 00 06 2015 00 06 2015 63 339 351

2004 71 5-6 2013 76 170-7 1996 2010 26 320-32 1985 8 13-9 1982 71 101-6 1984 77 81-97 R Development Core Team 2013 2011 158 2505-13 1998 44 7-59 1985 15 1-277 1999 57 17-27 1995 124 279-92 2011 65 23-35 1996 326/327 213-5 2008 88 21-8 2004 6 411-6 2014 2005 205 171-82 1987 38 217-24 2012 2013 1980 30 467-74 1982 52 353-94 1992 81 31-41 2014 281 20132284 1991 145 205-20 2014 66 4 4 329-42 1977 5 59-82 1997 152 145-154. 2009 75 2585-605 2003 2013 275-83 2008 153 907-24 2010 213 520-5 2006 86 783-90 2009 2011 13 1521-32 2002 9 155-64 1990 7 17-28 1996 4 93-7 2012 21 130-44 1991 111 431-5 1992 73 1597-605 1983 13 1997 128 657-63 2008 619 167-80 1978 2 69-91 2008 65 1-11 1999 525530 R Development Core Team 2013 3 1-111 2003 15 67-74 R Development Core Team 2013 2002 45 63-91 1990 13 15-20 1998 47 147-58 1999 16 197-223 2011 65 13-21 2009 11 7-14 1984 19 55-63 2013 2011 128 117-28 2003 248 109-23 2006 1998 33 43-72 2004 2009