Frequencies for first 10,000 rows of dmeduc variable in natl1980 dataset :

  Education |
  of Mother |
     Detail |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.03        0.03
          1 |          2        0.02        0.05
          2 |          2        0.02        0.07
          3 |          3        0.03        0.10
          4 |          5        0.05        0.15
          5 |         18        0.18        0.33
          6 |         39        0.39        0.72
          7 |        160        1.60        2.32
          8 |        366        3.66        5.98
          9 |        741        7.41       13.39
         10 |        985        9.85       23.24
         11 |        966        9.66       32.90
         12 |      4,035       40.35       73.25
         13 |        688        6.88       80.13
         14 |        669        6.69       86.82
         15 |        253        2.53       89.35
         16 |        711        7.11       96.46
         17 |        333        3.33       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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