Frequencies for first 10,000 rows of uniqueplandesign variable in plan2017 dataset :

Unique Plan |
     Design |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,343       13.43       13.43
         No |      5,621       56.21       69.64
        Yes |      3,036       30.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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