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

  Peak flow |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,984       99.84       99.84
        Yes |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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