Frequencies for first 10,000 rows of prov2245 variable in pos1996 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |        400        4.00       92.03
          1 |        586        5.86       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