Frequencies for contractid variable in pdp2016 dataset :

Contract ID |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.08        0.08
      S0522 |         98        7.88        7.96
      S1030 |          4        0.32        8.29
      S1140 |          1        0.08        8.37
      S2468 |          2        0.16        8.53
      S2505 |          7        0.56        9.09
      S2874 |          2        0.16        9.25
      S2893 |          8        0.64        9.90
      S4054 |          2        0.16       10.06
      S4607 |         33        2.65       12.71
      S4802 |          7        0.56       13.27
      S5540 |          2        0.16       13.44
      S5552 |          3        0.24       13.68
      S5580 |          3        0.24       13.92
      S5584 |          2        0.16       14.08
      S5593 |          4        0.32       14.40
      S5596 |         36        2.90       17.30
      S5601 |        101        8.13       25.42
      S5609 |          4        0.32       25.74
      S5660 |        102        8.21       33.95
      S5715 |         12        0.97       34.92
      S5726 |          3        0.24       35.16
      S5743 |         14        1.13       36.28
      S5753 |          2        0.16       36.44
      S5755 |        136       10.94       47.39
      S5768 |        102        8.21       55.59
      S5795 |          2        0.16       55.75
      S5805 |          1        0.08       55.83
      S5810 |         51        4.10       59.94
      S5820 |         55        4.42       64.36
      S5877 |          4        0.32       64.68
      S5884 |        150       12.07       76.75
      S5904 |          2        0.16       76.91
      S5916 |          4        0.32       77.23
      S5921 |         51        4.10       81.34
      S5953 |          2        0.16       81.50
      S5967 |        102        8.21       89.70
      S5983 |          2        0.16       89.86
      S5993 |          2        0.16       90.02
      S6311 |          1        0.08       90.10
      S6506 |          2        0.16       90.27
      S7230 |          4        0.32       90.59
      S7610 |          1        0.08       90.67
      S7694 |         65        5.23       95.90
      S8067 |          4        0.32       96.22
      S9579 |         47        3.78      100.00
------------+-----------------------------------
      Total |      1,243      100.00

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