Frequencies for first 10,000 rows of rdlgy_srvc_cd variable in pos2003 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,140       91.40       91.40
          1 |        161        1.61       93.01
          2 |        679        6.79       99.80
          3 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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