Frequencies for first 10,000 rows of mplbir variable in natl1971 dataset :

   Mother's |
   Place of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,902       79.02       79.02
          2 |          2        0.02       79.04
          3 |          5        0.05       79.09
          4 |         32        0.32       79.41
          5 |         59        0.59       80.00
          6 |         10        0.10       80.10
          7 |          6        0.06       80.16
          9 |         18        0.18       80.34
         10 |        212        2.12       82.46
         11 |        252        2.52       84.98
         12 |          7        0.07       85.05
         13 |          5        0.05       85.10
         14 |         61        0.61       85.71
         15 |         42        0.42       86.13
         16 |         12        0.12       86.25
         17 |         19        0.19       86.44
         18 |         44        0.44       86.88
         19 |         70        0.70       87.58
         20 |          6        0.06       87.64
         21 |         20        0.20       87.84
         22 |         21        0.21       88.05
         23 |         49        0.49       88.54
         24 |         10        0.10       88.64
         25 |        215        2.15       90.79
         26 |         31        0.31       91.10
         27 |          3        0.03       91.13
         28 |          9        0.09       91.22
         30 |          3        0.03       91.25
         31 |         13        0.13       91.38
         32 |          6        0.06       91.44
         33 |         59        0.59       92.03
         34 |         63        0.63       92.66
         35 |          4        0.04       92.70
         36 |         72        0.72       93.42
         37 |         21        0.21       93.63
         38 |          8        0.08       93.71
         39 |         37        0.37       94.08
         40 |          1        0.01       94.09
         41 |         46        0.46       94.55
         42 |          4        0.04       94.59
         43 |        204        2.04       96.63
         44 |         79        0.79       97.42
         45 |          5        0.05       97.47
         46 |          4        0.04       97.51
         47 |         54        0.54       98.05
         48 |         15        0.15       98.20
         49 |         34        0.34       98.54
         50 |         14        0.14       98.68
         51 |          1        0.01       98.69
         52 |          5        0.05       98.74
         55 |          6        0.06       98.80
         56 |          1        0.01       98.81
         57 |          3        0.03       98.84
         58 |          8        0.08       98.92
         59 |         66        0.66       99.58
         99 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016