Frequencies for measure_start_quarter variable in measure_dates dataset :

Measure_Sta |
 rt_Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
     1Q2012 |          5        5.26        5.26
     1Q2013 |         12       12.63       17.89
     1Q2014 |          1        1.05       18.95
     2Q2010 |          1        1.05       20.00
     2Q2013 |         47       49.47       69.47
     3Q2010 |         12       12.63       82.11
     3Q2011 |          6        6.32       88.42
     3Q2012 |          8        8.42       96.84
     4Q2013 |          3        3.16      100.00
------------+-----------------------------------
      Total |         95      100.00

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