Frequencies for first 10,000 rows of day variable in nadacc20160420 dataset :

        Day |      Freq.     Percent        Cum.
------------+-----------------------------------
         20 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Feb 2018