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

   Services |
  Provided: |
   PET Scan |
   Services |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,614       86.14       86.14
          0 |      1,295       12.95       99.09
          1 |         28        0.28       99.37
          2 |         52        0.52       99.89
          3 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Apr 2019