Frequencies for first 10,000 rows of mage36 variable in natlterr1995 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         71        0.71        0.71
          2 |        172        1.72        2.43
          3 |        284        2.84        5.27
          4 |        430        4.30        9.57
          5 |        516        5.16       14.73
          6 |        621        6.21       20.94
          7 |        627        6.27       27.21
          8 |        586        5.86       33.07
          9 |        668        6.68       39.75
         10 |        632        6.32       46.07
         11 |        611        6.11       52.18
         12 |        570        5.70       57.88
         13 |        515        5.15       63.03
         14 |        481        4.81       67.84
         15 |        508        5.08       72.92
         16 |        478        4.78       77.70
         17 |        396        3.96       81.66
         18 |        367        3.67       85.33
         19 |        323        3.23       88.56
         20 |        236        2.36       90.92
         21 |        215        2.15       93.07
         22 |        190        1.90       94.97
         23 |        129        1.29       96.26
         24 |        102        1.02       97.28
         25 |         99        0.99       98.27
         26 |         74        0.74       99.01
         27 |         33        0.33       99.34
         28 |         27        0.27       99.61
         29 |         19        0.19       99.80
         30 |         10        0.10       99.90
         31 |          1        0.01       99.91
         32 |          1        0.01       99.92
         33 |          3        0.03       99.95
         34 |          3        0.03       99.98
         36 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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