Frequencies for first 10,000 rows of rdlgy_srvc_cd variable in pos2007 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,666       96.66       96.66
          1 |         67        0.67       97.33
          2 |        247        2.47       99.80
          3 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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