Frequencies for first 10,000 rows of prov0895 variable in pos1993 dataset :

    general |
 supervisor |
          - |
md/doctorat |
          e |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,792       97.92       97.92
          1 |        136        1.36       99.28
          2 |         45        0.45       99.73
          3 |         14        0.14       99.87
          4 |          4        0.04       99.91
          5 |          3        0.03       99.94
          6 |          1        0.01       99.95
          8 |          3        0.03       99.98
          9 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016