Frequencies for measure_start_date variable in measure_dates dataset :

Measure_Start_Dat |
                e |      Freq.     Percent        Cum.
------------------+-----------------------------------
01/01/12 00:00:00 |         10       10.20       10.20
01/01/13 00:00:00 |         17       17.35       27.55
07/01/09 00:00:00 |         11       11.22       38.78
07/01/10 00:00:00 |          6        6.12       44.90
07/01/11 00:00:00 |          1        1.02       45.92
07/01/12 00:00:00 |          6        6.12       52.04
10/01/12 00:00:00 |         47       47.96      100.00
------------------+-----------------------------------
            Total |         98      100.00

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