Frequencies for startdate variable in mmp2016 dataset :

 Start Date |      Freq.     Percent        Cum.
------------+-----------------------------------
  01oct2013 |         11        1.63        1.63
  01feb2014 |         42        6.24        7.88
  01apr2014 |        277       41.16       49.03
  01may2014 |         63        9.36       58.40
  01jul2014 |          1        0.15       58.54
  01jan2015 |         89       13.22       71.77
  01feb2015 |        134       19.91       91.68
  01mar2015 |         46        6.84       98.51
  01may2015 |          8        1.19       99.70
  01jul2015 |          1        0.15       99.85
          . |          1        0.15      100.00
------------+-----------------------------------
      Total |        673      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018