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

 Seizures U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          7        0.07        0.07
          2 |      8,808       88.08       88.15
          9 |      1,185       11.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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