Frequencies for first 10,000 rows of incphys variable in nhamcsed2006 dataset :

  in last 2 |
 years, has |
       ed's |
   physical |
 space been |
  expanded? |      Freq.     Percent        Cum.
------------+-----------------------------------
        yes |      2,132       21.32       21.32
         no |      7,417       74.17       95.49
    unknown |        239        2.39       97.88
      blank |        212        2.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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