Frequencies for first 10,000 rows of febrile variable in natl1997 dataset :

    Febrile |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        155        1.55        1.55
          2 |      9,838       98.38       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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