Frequencies for first 10,000 rows of quarter variable in sdued2015 dataset :

    Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,534       85.34       85.34
          2 |      1,466       14.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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