Frequencies for first 10,000 rows of rdlgy_srvc_cd variable in pos2013 dataset 

  Ancillary |
  Services: |
  Radiology |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      9,599       95.99       95.99
          1 |         82        0.82       96.81
          2 |        302        3.02       99.83
          3 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016