Frequencies for first 10,000 rows of pet_scan_srvc_cd variable in pos2010 dataset :

   SRV: PET |
       SCAN |
   SERVICES |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,295       12.95       99.21
          1 |         23        0.23       99.44
          2 |         48        0.48       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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