Frequencies for first 10,000 rows of ekg_srvc_cd variable in pos2002 dataset :

   srv: ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,212       92.12       92.12
          0 |         45        0.45       92.57
          1 |        212        2.12       94.69
          2 |        517        5.17       99.86
          3 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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