Frequencies for first 10,000 rows of msa variable in namcs2014 dataset :

      Metropolitan Statistical Area |
       Status of physician location |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
MSA (Metropolitan Statistical Area) |      9,394       93.94       93.94
                            Non-MSA |        606        6.06      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017