Frequencies for first 10,000 rows of uab_nseiz variable in natl2005 dataset :

 Seizures U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          8        0.08        0.08
          2 |      9,863       98.63       98.71
          9 |        129        1.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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