Frequencies for first 10,000 rows of rdlgy_srvc_cd variable in pos1992 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,640       96.40       96.40
          1 |         79        0.79       97.19
          2 |        276        2.76       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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