Frequencies for perform variable in hvbp_quarters dataset :

                  Performance Period |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
February 1, 2013 - December 31, 2013 |          1        3.85        3.85
 January 1, 2013 - December 31, 2013 |         20       76.92       80.77
     May 1, 2013 - December 31, 2013 |          1        3.85       84.62
     October 1, 2012 - June 30, 2013 |          3       11.54       96.15
    October 15, 2012 - June 30, 2013 |          1        3.85      100.00
-------------------------------------+-----------------------------------
                               Total |         26      100.00

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