Frequencies for first 10,000 rows of uld_seiz variable in natl2006 dataset :

   Seizures |
     During |
  Labor RFP |
717=f_uld_s |
   eizure U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |      9,866       98.66       98.68
          9 |        132        1.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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