Frequencies for first 10,000 rows of msa variable in nhamcsed2015 dataset :

      Metropolitan statistical area |
                             status |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
MSA (Metropolitan Statistical Area) |      8,054       80.54       80.54
                            Non-MSA |      1,946       19.46      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017