Frequencies for basebeg variable in hvbp_quarters dataset :

   Baseline |
     Period |      Freq.     Percent        Cum.
------------+-----------------------------------
  01jul2009 |          3       17.65       17.65
  01apr2010 |         14       82.35      100.00
------------+-----------------------------------
      Total |         17      100.00

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