Frequencies for first 10,000 rows of versionnum variable in rate2015 dataset :

    Version |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      1,128       11.28       11.28
          4 |        426        4.26       15.54
          8 |        138        1.38       16.92
         15 |      8,308       83.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017