Frequencies for first 10,000 rows of pet_scan_srvc_cd variable in pos2007 dataset :

   srv: pet |
       scan |
   services |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,296       12.96       99.78
          1 |          6        0.06       99.84
          2 |         12        0.12       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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