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

   SRV: EKG |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,632       96.32       96.32
          0 |         32        0.32       96.64
          1 |        125        1.25       97.89
          2 |        201        2.01       99.90
          3 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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