Frequencies for first 10,000 rows of prov2135 variable in pos2001 dataset :

   srv: ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,267       92.67       92.67
          0 |         41        0.41       93.08
          1 |        199        1.99       95.07
          2 |        485        4.85       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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