Frequencies for first 10,000 rows of quarter variable in sdued2010 dataset :

    Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,607       76.07       76.07
          2 |      2,393       23.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Feb 2018