Frequencies for first 10,000 rows of opdatemm variable in h126f dataset :

 EVENT DATE |
    - MONTH |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        120        1.20        1.20
          1 |        904        9.04       10.24
          2 |        886        8.86       19.10
          3 |        794        7.94       27.04
          4 |        798        7.98       35.02
          5 |        725        7.25       42.27
          6 |        864        8.64       50.91
          7 |        910        9.10       60.01
          8 |        843        8.43       68.44
          9 |        761        7.61       76.05
         10 |        820        8.20       84.25
         11 |        813        8.13       92.38
         12 |        762        7.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Feb 2018