Frequencies for first 10,000 rows of muyear variable in nhamcsed2013 dataset :

 When did you |
  first apply |
  or when did |
you intend to |
       apply? |      Freq.     Percent        Cum.
--------------+-----------------------------------
        Blank |     10,000      100.00      100.00
--------------+-----------------------------------
        Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016