Frequencies for contractid variable in mmp2015 dataset :

Contract ID |      Freq.     Percent        Cum.
------------+-----------------------------------
      H0022 |         12        2.63        2.63
      H0137 |          9        1.97        4.61
      H0147 |        103       22.59       27.19
      H0148 |          2        0.44       27.63
      H0281 |          6        1.32       28.95
      H0336 |          6        1.32       30.26
      H0773 |         15        3.29       33.55
      H0927 |          6        1.32       34.87
      H2005 |          3        0.66       35.53
      H2506 |          5        1.10       36.62
      H2531 |         12        2.63       39.25
      H3067 |         95       20.83       60.09
      H3237 |          2        0.44       60.53
      H3480 |        103       22.59       83.11
      H5172 |          1        0.22       83.33
      H5280 |         13        2.85       86.18
      H5355 |          2        0.44       86.62
      H6080 |          4        0.88       87.50
      H6229 |          2        0.44       87.94
      H6751 |          5        1.10       89.04
      H7172 |         14        3.07       92.11
      H7419 |          2        0.44       92.54
      H7885 |          1        0.22       92.76
      H7890 |          1        0.22       92.98
      H8046 |         15        3.29       96.27
      H8258 |          1        0.22       96.49
      H8452 |         12        2.63       99.12
      H8677 |          4        0.88      100.00
------------+-----------------------------------
      Total |        456      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016