Frequencies for modvers variable in icd2ccesrd21xw2014 dataset :

      Model |
    Version |      Freq.     Percent        Cum.
------------+-----------------------------------
         21 |      3,166      100.00      100.00
------------+-----------------------------------
      Total |      3,166      100.00

by Jean Roth , jroth@nber.org , 12 Jan 2016