Frequencies for first 10,000 rows of eremind variable in namcs2007 dataset :

  practice has |
  comp sys for |
    remind for |
interven/scree |
   ning tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        143        1.43        1.43
       unknown |        251        2.51        3.94
           yes |      2,903       29.03       32.97
            no |      6,614       66.14       99.11
    turned off |         89        0.89      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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