Frequencies for first 10,000 rows of uld_febr variable in natl2004 dataset :

  Febrile U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        165        1.65        1.65
          2 |      8,861       88.61       90.26
          9 |        974        9.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016