Frequencies for first 10,000 rows of prov2245 variable in pos1999 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          0 |        369        3.69       92.54
          1 |        550        5.50       98.04
          2 |        177        1.77       99.81
          3 |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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