Frequencies for first 10,000 rows of mgntc_rsnc_img_srvc_cd variable in pos2016 dataset :

  Services: |
   MRI Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,569       85.69       85.69
          0 |        954        9.54       95.23
          1 |        271        2.71       97.94
          2 |        157        1.57       99.51
          3 |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Jan 2017