Frequencies for first 10,000 rows of prov2135 variable in pos2006 dataset :

   srv: ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,531       95.31       95.31
          0 |         31        0.31       95.62
          1 |        147        1.47       97.09
          2 |        276        2.76       99.85
          3 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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