Frequencies for first 10,000 rows of herpes variable in natl1991 dataset :

     Herpes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         40        0.40        0.40
          2 |      9,951       99.51       99.91
          8 |          2        0.02       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015