Frequencies for first 10,000 rows of nodisp variable in nhamcsopd2000 dataset :

disposition |
- no answer |
    to item |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,760       97.60       97.60
          1 |        240        2.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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