Frequencies for first 10,000 rows of residnce variable in nhamcsed2012 dataset :

Patient residence |      Freq.     Percent        Cum.
------------------+-----------------------------------
            Blank |        115        1.15        1.15
          Unknown |        286        2.86        4.01
Private residence |      9,200       92.00       96.01
     Nursing home |        207        2.07       98.08
         Homeless |         49        0.49       98.57
            Other |        143        1.43      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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