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

  does ed have |
  computerized |
    system for |
    orders for |
        tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        103        1.03        1.03
       unknown |        104        1.04        2.07
           yes |      7,984       79.84       81.91
            no |      1,809       18.09      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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