Frequencies for first 10,000 rows of prov2535 variable in pos2001 dataset :

       srv: |
 vocational |
   guidance |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,570       85.70       85.70
          0 |      1,390       13.90       99.60
          1 |          5        0.05       99.65
          2 |         33        0.33       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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