Frequencies for first 10,000 rows of quarterbegindate variable in sdued1993 dataset :

    Quarter |
 Begin Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 01/01/1993 |      5,587       55.87       55.87
 04/01/1993 |      4,413       44.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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