Frequencies for measure_start_quarter variable in measure_dates dataset :

Measure_Sta |
 rt_Quarter |      Freq.     Percent        Cum.
------------+-----------------------------------
     1Q2012 |          4        4.17        4.17
     1Q2013 |          5        5.21        9.38
     1Q2014 |          1        1.04       10.42
     2Q2010 |          1        1.04       11.46
     3Q2010 |         12       12.50       23.96
     3Q2011 |          6        6.25       30.21
     3Q2012 |          8        8.33       38.54
     3Q2013 |         56       58.33       96.88
     4Q2012 |          1        1.04       97.92
     4Q2013 |          2        2.08      100.00
------------+-----------------------------------
      Total |         96      100.00

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