Frequencies for first 10,000 rows of prov2245 variable in pos1997 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |        401        4.01       91.93
          1 |        590        5.90       97.83
          2 |        195        1.95       99.78
          3 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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