Frequencies for first 10,000 rows of mplbir variable in natl1970 dataset :

   Mother's |
   Place of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,963       79.63       79.63
          2 |          5        0.05       79.68
          3 |          4        0.04       79.72
          4 |         35        0.35       80.07
          5 |         52        0.52       80.59
          6 |          6        0.06       80.65
          7 |          6        0.06       80.71
          8 |          3        0.03       80.74
          9 |          1        0.01       80.75
         10 |        164        1.64       82.39
         11 |        270        2.70       85.09
         12 |          3        0.03       85.12
         13 |          5        0.05       85.17
         14 |         55        0.55       85.72
         15 |         44        0.44       86.16
         16 |         16        0.16       86.32
         17 |         15        0.15       86.47
         18 |         58        0.58       87.05
         19 |         41        0.41       87.46
         20 |          6        0.06       87.52
         21 |         10        0.10       87.62
         22 |         21        0.21       87.83
         23 |         54        0.54       88.37
         24 |         15        0.15       88.52
         25 |        223        2.23       90.75
         26 |         41        0.41       91.16
         27 |          4        0.04       91.20
         28 |          9        0.09       91.29
         29 |          1        0.01       91.30
         30 |          2        0.02       91.32
         31 |         10        0.10       91.42
         32 |          6        0.06       91.48
         33 |         59        0.59       92.07
         34 |         58        0.58       92.65
         35 |          2        0.02       92.67
         36 |         60        0.60       93.27
         37 |         15        0.15       93.42
         38 |          3        0.03       93.45
         39 |         62        0.62       94.07
         40 |          7        0.07       94.14
         41 |         37        0.37       94.51
         42 |          3        0.03       94.54
         43 |        187        1.87       96.41
         44 |         88        0.88       97.29
         45 |          8        0.08       97.37
         46 |          1        0.01       97.38
         47 |         46        0.46       97.84
         48 |         21        0.21       98.05
         49 |         30        0.30       98.35
         50 |         25        0.25       98.60
         51 |          5        0.05       98.65
         55 |          8        0.08       98.73
         56 |          2        0.02       98.75
         58 |          6        0.06       98.81
         59 |         64        0.64       99.45
         99 |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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