Frequencies for measure_start_date variable in measure_dates dataset :

Measure_Start_Dat |
                e |      Freq.     Percent        Cum.
------------------+-----------------------------------
01/01/12 00:00:00 |         15        9.26        9.26
01/01/13 00:00:00 |          4        2.47       11.73
01/01/14 00:00:00 |         35       21.60       33.33
01/01/15 00:00:00 |          2        1.23       34.57
04/01/12 00:00:00 |          1        0.62       35.19
04/01/14 00:00:00 |          4        2.47       37.65
07/01/11 00:00:00 |          5        3.09       40.74
07/01/12 00:00:00 |         19       11.73       52.47
07/01/13 00:00:00 |         12        7.41       59.88
07/01/14 00:00:00 |          8        4.94       64.81
10/01/10 00:00:00 |          3        1.85       66.67
10/01/12 00:00:00 |          3        1.85       68.52
10/01/13 00:00:00 |          1        0.62       69.14
10/01/14 00:00:00 |         48       29.63       98.77
10/15/10 00:00:00 |          1        0.62       99.38
10/15/12 00:00:00 |          1        0.62      100.00
------------------+-----------------------------------
            Total |        162      100.00

by Jean Roth , jroth@nber.org , 15 Nov 2016