Frequencies for first 10,000 rows of prov2535 variable in pos1993 dataset :

       srv: |
 vocational |
   guidance |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,870       88.70       88.70
          0 |      1,102       11.02       99.72
          1 |          7        0.07       99.79
          2 |         20        0.20       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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