Frequencies for first 10,000 rows of mage36 variable in natl1999 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         37        0.37        0.37
          2 |        104        1.04        1.41
          3 |        185        1.85        3.26
          4 |        317        3.17        6.43
          5 |        464        4.64       11.07
          6 |        588        5.88       16.95
          7 |        634        6.34       23.29
          8 |        635        6.35       29.64
          9 |        664        6.64       36.28
         10 |        554        5.54       41.82
         11 |        582        5.82       47.64
         12 |        571        5.71       53.35
         13 |        569        5.69       59.04
         14 |        553        5.53       64.57
         15 |        549        5.49       70.06
         16 |        482        4.82       74.88
         17 |        464        4.64       79.52
         18 |        369        3.69       83.21
         19 |        321        3.21       86.42
         20 |        309        3.09       89.51
         21 |        271        2.71       92.22
         22 |        198        1.98       94.20
         23 |        139        1.39       95.59
         24 |        157        1.57       97.16
         25 |         78        0.78       97.94
         26 |         87        0.87       98.81
         27 |         43        0.43       99.24
         28 |         35        0.35       99.59
         29 |         21        0.21       99.80
         30 |          8        0.08       99.88
         31 |          7        0.07       99.95
         32 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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