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

  in last 2 |
 years, has |
       ed's |
   physical |
 space been |
  expanded? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |        103        1.03        1.03
    unknown |        184        1.84        2.87
        yes |      2,558       25.58       28.45
         no |      7,155       71.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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