Frequencies for first 10,000 rows of prov2535 variable in pos1995 dataset :

       srv: |
 vocational |
   guidance |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,740       87.40       87.40
          0 |      1,243       12.43       99.83
          1 |          3        0.03       99.86
          2 |         12        0.12       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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