Frequencies for first 10,000 rows of msa variable in namcs2004 dataset :

                msa or non-msa area |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
MSA (Metropolitan Statistical Area) |      8,271       82.71       82.71
                            Non-MSA |      1,729       17.29      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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