Frequencies for baseend variable in hvbp_quarters dataset :

   Baseline |
     Period |      Freq.     Percent        Cum.
------------+-----------------------------------
  30jun2011 |          4       15.38       15.38
  31dec2011 |         22       84.62      100.00
------------+-----------------------------------
      Total |         26      100.00

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