Frequencies for first 10,000 rows of nodisp variable in nhamcsopd2009 dataset :

  no answer to disposition item |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
one or more dispositions marked |      9,784       97.84       97.84
   no visit dispositions marked |        216        2.16      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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