Frequencies for first 10,000 rows of mgntc_rsnc_img_srvc_cd variable in pos2011 dataset :

   Services |
  Provided: |
   Magnetic |
  Resonance |
    Imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,614       86.14       86.14
          0 |      1,066       10.66       96.80
          1 |        169        1.69       98.49
          2 |        127        1.27       99.76
          3 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Apr 2019