Frequencies for first 10,000 rows of uniqueplandesign variable in plan2016 dataset :

Unique Plan |
     Design |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,826       18.26       18.26
         No |      4,159       41.59       59.85
        Yes |      4,015       40.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Oct 2016