Frequencies for first 10,000 rows of prov0880 variable in pos1991 dataset :

    general |
 supervisor |
 - cytotech |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,742       97.42       97.42
          1 |        135        1.35       98.77
          2 |         46        0.46       99.23
          3 |         29        0.29       99.52
          4 |         17        0.17       99.69
          5 |         13        0.13       99.82
          6 |          5        0.05       99.87
          7 |          1        0.01       99.88
          8 |          3        0.03       99.91
          9 |          5        0.05       99.96
         11 |          2        0.02       99.98
         13 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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