Frequencies for first 10,000 rows of dmeduc variable in natl1996 dataset :

  Education |
  of Mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.03        0.03
          1 |          2        0.02        0.05
          2 |          3        0.03        0.08
          3 |          4        0.04        0.12
          4 |          4        0.04        0.16
          5 |          7        0.07        0.23
          6 |         29        0.29        0.52
          7 |        103        1.03        1.55
          8 |        288        2.88        4.43
          9 |        530        5.30        9.73
         10 |        751        7.51       17.24
         11 |        844        8.44       25.68
         12 |      3,356       33.56       59.24
         13 |        771        7.71       66.95
         14 |      1,102       11.02       77.97
         15 |        377        3.77       81.74
         16 |      1,265       12.65       94.39
         17 |        506        5.06       99.45
         99 |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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