Frequencies for measure_start_quarter variable in measure_dates dataset :

Measure_Sta |
 rt_Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
     1Q2012 |         15        9.26        9.26
     1Q2013 |          4        2.47       11.73
     1Q2014 |         35       21.60       33.33
     1Q2015 |          2        1.23       34.57
     2Q2012 |          1        0.62       35.19
     2Q2014 |          4        2.47       37.65
     3Q2011 |          5        3.09       40.74
     3Q2012 |         19       11.73       52.47
     3Q2013 |         12        7.41       59.88
     3Q2014 |          8        4.94       64.81
     4Q2010 |          4        2.47       67.28
     4Q2012 |          4        2.47       69.75
     4Q2013 |          1        0.62       70.37
     4Q2014 |         48       29.63      100.00
------------+-----------------------------------
      Total |        162      100.00

by Jean Roth , jroth@nber.org , 15 Nov 2016