Frequencies for measure_start_date variable in measure_dates dataset :

Measure_Start_Dat |
                e |      Freq.     Percent        Cum.
------------------+-----------------------------------
01/01/12 00:00:00 |          5        5.26        5.26
01/01/13 00:00:00 |         12       12.63       17.89
01/01/14 00:00:00 |          1        1.05       18.95
04/01/10 00:00:00 |          1        1.05       20.00
04/01/13 00:00:00 |         47       49.47       69.47
07/01/10 00:00:00 |         12       12.63       82.11
07/01/11 00:00:00 |          6        6.32       88.42
07/01/12 00:00:00 |          8        8.42       96.84
10/01/13 00:00:00 |          3        3.16      100.00
------------------+-----------------------------------
            Total |         95      100.00

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