Frequencies for basebeg variable in hvbp_quarters dataset :

   Baseline |
     Period |      Freq.     Percent        Cum.
------------+-----------------------------------
  01oct2010 |          3       11.54       11.54
  15oct2010 |          1        3.85       15.38
  01jan2011 |         21       80.77       96.15
  01may2011 |          1        3.85      100.00
------------+-----------------------------------
      Total |         26      100.00

by Jean Roth , jroth@nber.org , 16 Nov 2016