Frequencies for first 10,000 rows of rdlgy_srvc_cd variable in pos2015 dataset 

  Ancillary |
  Services: |
  Radiology |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      9,578       95.78       95.78
          1 |         89        0.89       96.67
          2 |        313        3.13       99.80
          3 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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