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

  Education |
  of Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
          1 |          1        0.01        0.02
          2 |          3        0.03        0.05
          3 |          2        0.02        0.07
          4 |          2        0.02        0.09
          5 |          7        0.07        0.16
          6 |         22        0.22        0.38
          7 |        123        1.23        1.61
          8 |        296        2.96        4.57
          9 |        558        5.58       10.15
         10 |        744        7.44       17.59
         11 |        898        8.98       26.57
         12 |      3,611       36.11       62.68
         13 |        796        7.96       70.64
         14 |      1,008       10.08       80.72
         15 |        317        3.17       83.89
         16 |      1,055       10.55       94.44
         17 |        447        4.47       98.91
         99 |        109        1.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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