Frequencies for first 10,000 rows of eremind variable in namcs2008 dataset :

  practice has |
  comp sys for |
    remind for |
interven/scree |
   ning tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         61        0.61        0.61
       unknown |        337        3.37        3.98
           yes |      3,836       38.36       42.34
            no |      5,620       56.20       98.54
    turned off |        146        1.46      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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