Frequencies for first 10,000 rows of prov2245 variable in pos1995 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |        348        3.48       92.81
          1 |        537        5.37       98.18
          2 |        163        1.63       99.81
          3 |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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