Frequencies for measure_start_date variable in measure_dates dataset :

Measure_Start_Dat |
                e |      Freq.     Percent        Cum.
------------------+-----------------------------------
01/01/12 00:00:00 |          4        4.17        4.17
01/01/13 00:00:00 |          5        5.21        9.38
01/01/14 00:00:00 |          1        1.04       10.42
04/01/10 00:00:00 |          1        1.04       11.46
07/01/10 00:00:00 |         12       12.50       23.96
07/01/11 00:00:00 |          6        6.25       30.21
07/01/12 00:00:00 |          8        8.33       38.54
07/01/13 00:00:00 |         56       58.33       96.88
10/01/12 00:00:00 |          1        1.04       97.92
10/01/13 00:00:00 |          2        2.08      100.00
------------------+-----------------------------------
            Total |         96      100.00

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