Frequencies for first 10,000 rows of nuclr_mdcn_srvc_cd variable in pos2009 dataset :

       SRV: |
    NUCLEAR |
   MEDICINE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |        507        5.07       91.45
          1 |        583        5.83       97.28
          2 |        229        2.29       99.57
          3 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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