Frequencies for contractid variable in mmp2014 dataset :

Contract ID |      Freq.     Percent        Cum.
------------+-----------------------------------
      H0137 |          9       64.29       64.29
      H2005 |          3       21.43       85.71
      H7419 |          2       14.29      100.00
------------+-----------------------------------
      Total |         14      100.00

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