Frequencies for first 10,000 rows of prov0825 variable in pos1993 dataset :

        lab |
directors - |
       oral |
  pathology |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,986       99.86       99.86
          1 |          7        0.07       99.93
          2 |          3        0.03       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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