Frequencies for first 10,000 rows of prov0770 variable in pos1995 dataset :

cytotechnol |
ogists-6 mo |
      train |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,994       99.94       99.94
          1 |          5        0.05       99.99
          2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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