Frequencies for first 10,000 rows of prov2245 variable in pos2004 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |        455        4.55       92.21
          1 |        551        5.51       97.72
          2 |        205        2.05       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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