Frequencies for first 10,000 rows of dmeduc variable in natl1981 dataset :

  Education |
  of Mother |
     Detail |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          5        0.05        0.05
          2 |          2        0.02        0.07
          3 |          6        0.06        0.13
          4 |          8        0.08        0.21
          5 |         19        0.19        0.40
          6 |         53        0.53        0.93
          7 |        117        1.17        2.10
          8 |        378        3.78        5.88
          9 |        687        6.87       12.75
         10 |        955        9.55       22.30
         11 |        934        9.34       31.64
         12 |      4,073       40.73       72.37
         13 |        695        6.95       79.32
         14 |        681        6.81       86.13
         15 |        262        2.62       88.75
         16 |        735        7.35       96.10
         17 |        349        3.49       99.59
         99 |         41        0.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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