Frequencies for first 10,000 rows of nuclr_mdcn_srvc_cd variable in pos2005 dataset :

       srv: |
    nuclear |
   medicine |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |        464        4.64       91.95
          1 |        566        5.66       97.61
          2 |        210        2.10       99.71
          3 |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017