Frequencies for first 10,000 rows of rdlgy_srvc_cd variable in pos1994 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,575       95.75       95.75
          1 |        100        1.00       96.75
          2 |        320        3.20       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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