Frequencies for first 10,000 rows of prov0895 variable in pos1991 dataset :

    general |
 supervisor |
          - |
md/doctorat |
          e |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,722       97.22       97.22
          1 |        176        1.76       98.98
          2 |         58        0.58       99.56
          3 |         26        0.26       99.82
          4 |          9        0.09       99.91
          6 |          2        0.02       99.93
          8 |          2        0.02       99.95
          9 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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