Frequencies for msr_end_qtr variable in vwmeasure_dates dataset :

msr_end_qtr |      Freq.     Percent        Cum.
------------+-----------------------------------
       1Q11 |          1        1.43        1.43
       1Q11 |         41       58.57       60.00
       2Q10 |         24       34.29       94.29
       4Q09 |          4        5.71      100.00
------------+-----------------------------------
      Total |         70      100.00

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