Frequencies for first 10,000 rows of ilive variable in natl2013 dataset :

     Infant |
  Living at |
    Time of |
 Report RFP |
    571=? R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |          6        0.06        0.06
          U |          6        0.06        0.12
          Y |      9,988       99.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015