Frequencies for first 10,000 rows of quarterbegindate variable in sdued1996 dataset :

    Quarter |
 Begin Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 01/01/1996 |      6,368       63.68       63.68
 04/01/1996 |      3,632       36.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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