Frequencies for first 10,000 rows of residnce variable in nhamcsed2009 dataset :

    patient |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        388        3.88        3.88
         -8 |        409        4.09        7.97
          1 |      8,792       87.92       95.89
          2 |        212        2.12       98.01
          3 |         83        0.83       98.84
          4 |        116        1.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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