Frequencies for first 10,000 rows of prov2245 variable in pos1998 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |        391        3.91       91.96
          1 |        593        5.93       97.89
          2 |        188        1.88       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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