Frequencies for first 10,000 rows of msa variable in nhamcsed2004 dataset :

                         msa/nonmsa |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
msa (metropolitan statistical area) |      8,828       88.28       88.28
                            non-msa |      1,172       11.72      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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