Frequencies for msr_end_dttime variable in vwmeasure_dates dataset :

msr_end_dtt |
        ime |      Freq.     Percent        Cum.
------------+-----------------------------------
 03/31/2011 |          1        1.43        1.43
 06/30/2010 |         16       22.86       24.29
 06/30/2011 |         39       55.71       80.00
 12/31/2009 |          4        5.71       85.71
  3/31/2011 |          2        2.86       88.57
  6/30/2010 |          8       11.43      100.00
------------+-----------------------------------
      Total |         70      100.00

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