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

      Metropolitan statistical area |
                             status |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
MSA (Metropolitan Statistical Area) |     10,000      100.00      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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