Frequencies for first 10,000 rows of pet_scan_srvc_cd variable in pos2008 dataset :

   srv: pet |
       scan |
   services |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |      1,309       13.09       99.64
          1 |          9        0.09       99.73
          2 |         21        0.21       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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