Frequencies for msr_end_dttime variable in vwmeasure_dates dataset :

msr_end_dtt |
        ime |      Freq.     Percent        Cum.
------------+-----------------------------------
   1/1/2011 |          1        1.43        1.43
 12/31/2009 |          4        5.71        7.14
  3/31/2011 |         41       58.57       65.71
  6/30/2010 |         24       34.29      100.00
------------+-----------------------------------
      Total |         70      100.00

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