Frequencies for first 10,000 rows of pet_scan_srvc_cd variable in pos2009 dataset :

   SRV: PET |
       SCAN |
   SERVICES |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,299       12.99       99.37
          1 |         18        0.18       99.55
          2 |         37        0.37       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017