Frequencies for first 10,000 rows of acc_d_optime variable in mcbsatc2013 datas

    Minutes |
  waited at |
        OPD |      Freq.     Percent        Cum.
------------+-----------------------------------
         -8 |        336        3.36        3.36
         -7 |          4        0.04        3.40
          1 |      3,322       33.22       36.62
          2 |        216        2.16       38.78
          . |      6,122       61.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 24 May 2016