Frequencies for first 10,000 rows of quarter variable in sdued2012 dataset :

    Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,066       80.66       80.66
          2 |      1,934       19.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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