Frequencies for first 10,000 rows of prov0825 variable in pos1991 dataset :

        lab |
directors - |
       oral |
  pathology |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,983       99.83       99.83
          1 |          7        0.07       99.90
          2 |          5        0.05       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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