Frequencies for first 10,000 rows of mgntc_rsnc_img_srvc_cd variable in pos2018 dataset :

  Services: |
   MRI Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,560       85.60       85.60
          0 |        929        9.29       94.89
          1 |        294        2.94       97.83
          2 |        161        1.61       99.44
          3 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019