Frequencies for first 10,000 rows of mplbir variable in natl1981 dataset :

   Mother's |
   Place of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,278       72.78       72.78
          2 |         12        0.12       72.90
          3 |         12        0.12       73.02
          4 |         34        0.34       73.36
          5 |         89        0.89       74.25
          6 |         18        0.18       74.43
          7 |         11        0.11       74.54
          8 |          1        0.01       74.55
          9 |         11        0.11       74.66
         10 |        322        3.22       77.88
         11 |        273        2.73       80.61
         12 |          9        0.09       80.70
         13 |          2        0.02       80.72
         14 |        126        1.26       81.98
         15 |         61        0.61       82.59
         16 |         15        0.15       82.74
         17 |         23        0.23       82.97
         18 |         66        0.66       83.63
         19 |         68        0.68       84.31
         20 |          9        0.09       84.40
         21 |         27        0.27       84.67
         22 |         17        0.17       84.84
         23 |        115        1.15       85.99
         24 |         14        0.14       86.13
         25 |        181        1.81       87.94
         26 |         39        0.39       88.33
         27 |          3        0.03       88.36
         28 |          8        0.08       88.44
         29 |          4        0.04       88.48
         30 |          4        0.04       88.52
         31 |         29        0.29       88.81
         32 |         14        0.14       88.95
         33 |         92        0.92       89.87
         34 |         57        0.57       90.44
         35 |          2        0.02       90.46
         36 |        134        1.34       91.80
         37 |         32        0.32       92.12
         38 |          4        0.04       92.16
         39 |         55        0.55       92.71
         40 |         10        0.10       92.81
         41 |         52        0.52       93.33
         42 |          5        0.05       93.38
         43 |        218        2.18       95.56
         44 |        116        1.16       96.72
         45 |          8        0.08       96.80
         47 |         78        0.78       97.58
         48 |         17        0.17       97.75
         49 |         22        0.22       97.97
         50 |         16        0.16       98.13
         51 |          5        0.05       98.18
         52 |          4        0.04       98.22
         55 |          2        0.02       98.24
         56 |          2        0.02       98.26
         57 |          9        0.09       98.35
         59 |        163        1.63       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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