Frequencies for first 10,000 rows of herpes variable in linkco1991us_num dataset :

    Genital |
     herpes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         52        0.52        0.52
          2 |      9,656       96.56       97.08
          8 |         13        0.13       97.21
          9 |        279        2.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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