Frequencies for first 10,000 rows of mbcntry variable in natlterr2005 dataset :

   Mother's |
      Birth |
  Country R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,255       62.55       62.55
         AR |          3        0.03       62.58
         BR |          1        0.01       62.59
         CO |          3        0.03       62.62
         CS |          1        0.01       62.63
         CU |          5        0.05       62.68
         DR |         93        0.93       63.61
         ES |          2        0.02       63.63
         FR |          1        0.01       63.64
         GM |          2        0.02       63.66
         IN |          1        0.01       63.67
         IT |          1        0.01       63.68
         JM |          1        0.01       63.69
         JO |          2        0.02       63.71
         KU |          1        0.01       63.72
         MX |          5        0.05       63.77
         NI |          1        0.01       63.78
         NU |          1        0.01       63.79
         PE |          4        0.04       63.83
         PM |          3        0.03       63.86
         SY |          1        0.01       63.87
         TH |          1        0.01       63.88
         TN |          1        0.01       63.89
         US |      3,606       36.06       99.95
         VE |          4        0.04       99.99
         ZZ |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015