Frequencies for msr_strt_qtr variable in vwmeasure_dates dataset :

msr_strt_qt |
          r |      Freq.     Percent        Cum.
------------+-----------------------------------
       2Q10 |          1        1.43        1.43
       1Q09 |          4        5.71        7.14
       1Q11 |          2        2.86       10.00
       2Q10 |         36       51.43       61.43
       3Q07 |          6        8.57       70.00
       4Q08 |         18       25.71       95.71
       4Q10 |          3        4.29      100.00
------------+-----------------------------------
      Total |         70      100.00

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