Frequencies for first 10,000 rows of quarterbegindate variable in sdued2017 dataset :

    Quarter Begin Date |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
01/01/2017 12:00:00 AM |     10,000      100.00      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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