Frequencies for first 10,000 rows of mbcntry variable in natlterr2010 dataset :

   Mother's |
      Birth |
  Country R |      Freq.     Percent        Cum.
------------+-----------------------------------
         AR |          2        0.02        0.02
         BG |          1        0.01        0.03
         BU |          1        0.01        0.04
         CA |          5        0.05        0.09
         CH |        131        1.31        1.40
         CI |          2        0.02        1.42
         CO |          3        0.03        1.45
         CS |          2        0.02        1.47
         CU |          4        0.04        1.51
         CZ |          1        0.01        1.52
         DR |        110        1.10        2.62
         EC |          1        0.01        2.63
         FM |         71        0.71        3.34
         GE |          2        0.02        3.36
         GI |          1        0.01        3.37
         GM |          5        0.05        3.42
         HA |          1        0.01        3.43
         IN |          3        0.03        3.46
         JA |         23        0.23        3.69
         KE |          1        0.01        3.70
         KS |         53        0.53        4.23
         MX |         11        0.11        4.34
         NP |          3        0.03        4.37
         NU |          1        0.01        4.38
         PE |          3        0.03        4.41
         PM |          4        0.04        4.45
         RP |        294        2.94        7.39
         SC |          1        0.01        7.40
         SY |          1        0.01        7.41
         TH |          4        0.04        7.45
         UR |          2        0.02        7.47
         US |      7,088       70.88       78.35
         UY |          1        0.01       78.36
         VE |          2        0.02       78.38
         VI |          3        0.03       78.41
         YY |      2,119       21.19       99.60
         ZZ |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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