Frequencies for first 10,000 rows of dmeduc variable in natl1979 dataset :

  Education |
  of Mother |
     Detail |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          7        0.07        0.07
          1 |          1        0.01        0.08
          2 |          3        0.03        0.11
          3 |          2        0.02        0.13
          4 |         10        0.10        0.23
          5 |         13        0.13        0.36
          6 |         71        0.71        1.07
          7 |        157        1.57        2.64
          8 |        433        4.33        6.97
          9 |        709        7.09       14.06
         10 |      1,109       11.09       25.15
         11 |      1,025       10.25       35.40
         12 |      4,061       40.61       76.01
         13 |        584        5.84       81.85
         14 |        616        6.16       88.01
         15 |        242        2.42       90.43
         16 |        688        6.88       97.31
         17 |        244        2.44       99.75
         99 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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