Frequencies for first 10,000 rows of expspace variable in nhamcsed2007 dataset :

      plans to |
   extend ed's |
physical space |
    within the |
 next 2 years? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |      1,625       16.25       16.25
       unknown |        879        8.79       25.04
           yes |      3,710       37.10       62.14
            no |      3,786       37.86      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016