Frequencies for first 10,000 rows of nodisp variable in namcs2011 dataset :

  No answer to disposition item |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
One or more dispositions marked |      9,428       94.28       94.28
   No visit dispositions marked |        572        5.72      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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