Frequencies for first 10,000 rows of eeg variable in namcs2013 dataset :

Electroence |
  phalogram |
      (EEG) |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,989       99.89       99.89
        Yes |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017