Frequencies for first 10,000 rows of prov2245 variable in pos2006 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |        468        4.68       91.78
          1 |        580        5.80       97.58
          2 |        209        2.09       99.67
          3 |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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