Frequencies for first 10,000 rows of prov2245 variable in pos2002 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,812       88.12       88.12
          0 |        428        4.28       92.40
          1 |        554        5.54       97.94
          2 |        185        1.85       99.79
          3 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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