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 |         49       30.25       63.58
     2Q2012 |          1        0.62       64.20
     2Q2014 |          2        1.23       65.43
     3Q2011 |          5        3.09       68.52
     3Q2012 |         19       11.73       80.25
     3Q2013 |         12        7.41       87.65
     3Q2014 |          9        5.56       93.21
     4Q2010 |          4        2.47       95.68
     4Q2012 |          4        2.47       98.15
     4Q2014 |          2        1.23       99.38
     4Q2015 |          1        0.62      100.00
------------+-----------------------------------
      Total |        162      100.00

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