Frequencies for measure_start_quarter variable in measure_dates dataset :

Measure_Sta |
 rt_Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
     1Q2012 |         10       10.20       10.20
     1Q2013 |         17       17.35       27.55
     3Q2009 |         11       11.22       38.78
     3Q2010 |          6        6.12       44.90
     3Q2011 |          1        1.02       45.92
     3Q2012 |          6        6.12       52.04
     4Q2012 |         47       47.96      100.00
------------+-----------------------------------
      Total |         98      100.00

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