Frequencies for first 10,000 rows of ekg_srvc_cd variable in pos1995 dataset :

   srv: ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,552       95.52       95.52
          0 |         26        0.26       95.78
          1 |        129        1.29       97.07
          2 |        289        2.89       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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