Frequencies for first 10,000 rows of ekg_srvc_cd variable in pos2012 dataset :

   Service: |
        EKG |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      9,608       96.08       96.08
          0 |         23        0.23       96.31
          1 |        141        1.41       97.72
          2 |        223        2.23       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016