Frequencies for first 10,000 rows of mplbir variable in linkco1991us_num dataset :

   Place of |
   Birth of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        611        6.11        6.11
          2 |         60        0.60        6.71
          3 |        272        2.72        9.43
          4 |        222        2.22       11.65
          5 |      1,992       19.92       31.57
          6 |        231        2.31       33.88
          7 |        211        2.11       35.99
          8 |         82        0.82       36.81
          9 |        234        2.34       39.15
         10 |        793        7.93       47.08
         11 |        692        6.92       54.00
         12 |         21        0.21       54.21
         13 |         15        0.15       54.36
         14 |        161        1.61       55.97
         15 |         64        0.64       56.61
         16 |         36        0.36       56.97
         17 |         27        0.27       57.24
         18 |         29        0.29       57.53
         19 |         74        0.74       58.27
         20 |         12        0.12       58.39
         21 |         63        0.63       59.02
         22 |         52        0.52       59.54
         23 |        129        1.29       60.83
         24 |         37        0.37       61.20
         25 |         63        0.63       61.83
         26 |         62        0.62       62.45
         27 |         15        0.15       62.60
         28 |         33        0.33       62.93
         29 |         14        0.14       63.07
         30 |         14        0.14       63.21
         31 |         92        0.92       64.13
         32 |         27        0.27       64.40
         33 |        300        3.00       67.40
         34 |         69        0.69       68.09
         35 |         12        0.12       68.21
         36 |        134        1.34       69.55
         37 |         33        0.33       69.88
         38 |         27        0.27       70.15
         39 |        132        1.32       71.47
         40 |         15        0.15       71.62
         41 |         59        0.59       72.21
         42 |         15        0.15       72.36
         43 |         58        0.58       72.94
         44 |        189        1.89       74.83
         45 |         26        0.26       75.09
         46 |          5        0.05       75.14
         47 |         70        0.70       75.84
         48 |         54        0.54       76.38
         49 |         22        0.22       76.60
         50 |         35        0.35       76.95
         51 |         11        0.11       77.06
         52 |         46        0.46       77.52
         53 |          5        0.05       77.57
         54 |          2        0.02       77.59
         55 |         23        0.23       77.82
         56 |         35        0.35       78.17
         57 |      1,096       10.96       89.13
         59 |        951        9.51       98.64
         99 |        136        1.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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