Frequencies for first 10,000 rows of gradeat variable in morg83 dataset :

    Highest |
      grade |
   attended |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         82        0.82        0.82
          1 |         10        0.10        0.92
          2 |         31        0.31        1.23
          3 |         60        0.60        1.83
          4 |         56        0.56        2.39
          5 |         80        0.80        3.19
          6 |        184        1.84        5.03
          7 |        125        1.25        6.28
          8 |        495        4.95       11.23
          9 |        331        3.31       14.54
         10 |        569        5.69       20.23
         11 |        637        6.37       26.60
         12 |      3,700       37.00       63.60
         13 |        646        6.46       70.06
         14 |        973        9.73       79.79
         15 |        355        3.55       83.34
         16 |        979        9.79       93.13
         17 |        239        2.39       95.52
         18 |        448        4.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Mar 2017