Frequencies for first 10,000 rows of quarterbegindate variable in sdued1994 dataset :

    Quarter |
 Begin Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 01/01/1994 |      5,946       59.46       59.46
 04/01/1994 |      4,054       40.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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