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

  no answer to disposition item |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
one or more dispositions marked |      9,851       98.51       98.51
   no visit dispositions marked |        149        1.49      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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