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

    Febrile |
      (>100 |
 degrees F. |
      or 38 |
degrees C.) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        273        2.73        2.73
          2 |      9,520       95.20       97.93
          9 |        207        2.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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