Frequencies for first 10,000 rows of prov2135 variable in pos1998 dataset :

   srv: ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,416       94.16       94.16
          0 |         37        0.37       94.53
          1 |        153        1.53       96.06
          2 |        389        3.89       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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