Frequencies for first 10,000 rows of mplbir variable in natl1974 dataset :

   Mother's |
   Place of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,742       77.42       77.42
          3 |         10        0.10       77.52
          4 |         35        0.35       77.87
          5 |         68        0.68       78.55
          6 |          9        0.09       78.64
          7 |          4        0.04       78.68
          8 |          3        0.03       78.71
          9 |         13        0.13       78.84
         10 |        226        2.26       81.10
         11 |        233        2.33       83.43
         12 |          6        0.06       83.49
         13 |          6        0.06       83.55
         14 |         90        0.90       84.45
         15 |         52        0.52       84.97
         16 |         17        0.17       85.14
         17 |         22        0.22       85.36
         18 |         57        0.57       85.93
         19 |         71        0.71       86.64
         20 |          4        0.04       86.68
         21 |         12        0.12       86.80
         22 |         21        0.21       87.01
         23 |         63        0.63       87.64
         24 |          7        0.07       87.71
         25 |        223        2.23       89.94
         26 |         35        0.35       90.29
         27 |          3        0.03       90.32
         28 |          4        0.04       90.36
         29 |          3        0.03       90.39
         30 |          3        0.03       90.42
         31 |         19        0.19       90.61
         32 |         10        0.10       90.71
         33 |         52        0.52       91.23
         34 |         53        0.53       91.76
         35 |          5        0.05       91.81
         36 |         86        0.86       92.67
         37 |         19        0.19       92.86
         38 |          4        0.04       92.90
         39 |         45        0.45       93.35
         40 |          5        0.05       93.40
         41 |         42        0.42       93.82
         42 |          5        0.05       93.87
         43 |        242        2.42       96.29
         44 |         91        0.91       97.20
         45 |         12        0.12       97.32
         46 |          1        0.01       97.33
         47 |         46        0.46       97.79
         48 |         12        0.12       97.91
         49 |         19        0.19       98.10
         50 |         14        0.14       98.24
         51 |          2        0.02       98.26
         52 |          3        0.03       98.29
         55 |          4        0.04       98.33
         56 |          1        0.01       98.34
         57 |          4        0.04       98.38
         58 |         12        0.12       98.50
         59 |        111        1.11       99.61
         99 |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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