Frequencies for first 10,000 rows of uniqueplandesign variable in plan2014 dataset :

Unique Plan |
     Design |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,980       19.80       19.80
         No |      2,579       25.79       45.59
        Yes |      5,441       54.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017