Frequencies for first 10,000 rows of prov2245 variable in pos1993 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        374        3.74       92.30
          1 |        578        5.78       98.08
          2 |        174        1.74       99.82
          3 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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