Frequencies for first 10,000 rows of dmeduc variable in natl1977 dataset :

  Education |
  of Mother |
     Detail |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          6        0.06        0.06
          1 |          1        0.01        0.07
          3 |          8        0.08        0.15
          4 |         15        0.15        0.30
          5 |         21        0.21        0.51
          6 |         75        0.75        1.26
          7 |        176        1.76        3.02
          8 |        488        4.88        7.90
          9 |        844        8.44       16.34
         10 |      1,099       10.99       27.33
         11 |      1,090       10.90       38.23
         12 |      4,080       40.80       79.03
         13 |        526        5.26       84.29
         14 |        514        5.14       89.43
         15 |        203        2.03       91.46
         16 |        601        6.01       97.47
         17 |        213        2.13       99.60
         99 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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