Frequencies for first 10,000 rows of mplbir variable in natl1977 dataset :

   Mother's |
   Place of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,638       76.38       76.38
          2 |          3        0.03       76.41
          3 |         11        0.11       76.52
          4 |         41        0.41       76.93
          5 |         53        0.53       77.46
          6 |         14        0.14       77.60
          7 |          4        0.04       77.64
          8 |          2        0.02       77.66
          9 |         12        0.12       77.78
         10 |        250        2.50       80.28
         11 |        250        2.50       82.78
         12 |          5        0.05       82.83
         13 |          3        0.03       82.86
         14 |        100        1.00       83.86
         15 |         70        0.70       84.56
         16 |         17        0.17       84.73
         17 |         22        0.22       84.95
         18 |         49        0.49       85.44
         19 |         62        0.62       86.06
         20 |          8        0.08       86.14
         21 |         21        0.21       86.35
         22 |         13        0.13       86.48
         23 |         84        0.84       87.32
         24 |         11        0.11       87.43
         25 |        192        1.92       89.35
         26 |         43        0.43       89.78
         27 |          7        0.07       89.85
         28 |          6        0.06       89.91
         29 |          1        0.01       89.92
         30 |          2        0.02       89.94
         31 |         19        0.19       90.13
         32 |          9        0.09       90.22
         33 |         60        0.60       90.82
         34 |         51        0.51       91.33
         35 |          3        0.03       91.36
         36 |        100        1.00       92.36
         37 |         23        0.23       92.59
         38 |         11        0.11       92.70
         39 |         39        0.39       93.09
         40 |          9        0.09       93.18
         41 |         49        0.49       93.67
         42 |          4        0.04       93.71
         43 |        213        2.13       95.84
         44 |        118        1.18       97.02
         45 |          5        0.05       97.07
         46 |          3        0.03       97.10
         47 |         49        0.49       97.59
         48 |         20        0.20       97.79
         49 |         33        0.33       98.12
         50 |         17        0.17       98.29
         51 |          4        0.04       98.33
         52 |          7        0.07       98.40
         54 |          1        0.01       98.41
         55 |          2        0.02       98.43
         56 |          1        0.01       98.44
         57 |          3        0.03       98.47
         58 |         20        0.20       98.67
         59 |        124        1.24       99.91
         99 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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