Frequencies for first 10,000 rows of mplbir variable in natl1990 dataset :

   Place of |
   Birth of |
     Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,907       69.07       69.07
          2 |          7        0.07       69.14
          3 |         16        0.16       69.30
          4 |         41        0.41       69.71
          5 |        108        1.08       70.79
          6 |         16        0.16       70.95
          7 |          7        0.07       71.02
          8 |          8        0.08       71.10
          9 |         18        0.18       71.28
         10 |        274        2.74       74.02
         11 |        356        3.56       77.58
         12 |          7        0.07       77.65
         13 |          5        0.05       77.70
         14 |        190        1.90       79.60
         15 |         91        0.91       80.51
         16 |         14        0.14       80.65
         17 |         22        0.22       80.87
         18 |         71        0.71       81.58
         19 |         93        0.93       82.51
         20 |         14        0.14       82.65
         21 |         30        0.30       82.95
         22 |         27        0.27       83.22
         23 |        119        1.19       84.41
         24 |          7        0.07       84.48
         25 |        142        1.42       85.90
         26 |         52        0.52       86.42
         27 |          3        0.03       86.45
         28 |         17        0.17       86.62
         29 |          6        0.06       86.68
         30 |          1        0.01       86.69
         31 |         51        0.51       87.20
         32 |         13        0.13       87.33
         33 |        124        1.24       88.57
         34 |         67        0.67       89.24
         35 |          2        0.02       89.26
         36 |        138        1.38       90.64
         37 |         32        0.32       90.96
         38 |          6        0.06       91.02
         39 |         64        0.64       91.66
         40 |          6        0.06       91.72
         41 |         56        0.56       92.28
         42 |          8        0.08       92.36
         43 |        236        2.36       94.72
         44 |        122        1.22       95.94
         45 |          5        0.05       95.99
         47 |         65        0.65       96.64
         48 |         15        0.15       96.79
         49 |         22        0.22       97.01
         50 |         25        0.25       97.26
         51 |          3        0.03       97.29
         52 |          6        0.06       97.35
         53 |          1        0.01       97.36
         55 |          6        0.06       97.42
         57 |          7        0.07       97.49
         59 |        236        2.36       99.85
         99 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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