Frequencies for first 10,000 rows of quarter variable in sdued2013 dataset :

    Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,336       83.36       83.36
          2 |      1,664       16.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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