Frequencies for first 10,000 rows of chow_prior_dt variable in pos1996 dataset :

      prior |
  admission |
 suspension |
       date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,997       99.97       99.97
   19850531 |          1        0.01       99.98
   19860430 |          1        0.01       99.99
   19860530 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017