Frequencies for first 10,000 rows of prov3475 variable in pos1997 dataset :

       srv: |
vocational- |
 onsite-non |
      resid |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,410       74.10       74.10
          N |      2,572       25.72       99.82
          Y |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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