Frequencies for first 10,000 rows of prov2245 variable in pos2001 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |        405        4.05       92.42
          1 |        554        5.54       97.96
          2 |        184        1.84       99.80
          3 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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