Frequencies for first 10,000 rows of herpes variable in natl1990 dataset :

     Herpes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         50        0.50        0.50
          2 |      9,899       98.99       99.49
          8 |          3        0.03       99.52
          9 |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016