Frequencies for first 10,000 rows of prov2135 variable in pos1991 dataset :

   srv: ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,683       96.83       96.83
          0 |         10        0.10       96.93
          1 |         85        0.85       97.78
          2 |        219        2.19       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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