Frequencies for first 10,000 rows of msa variable in namcs2015 dataset :

Metropolita |
          n |
Statistical |
Area Status |
         of |
  physician |
   location |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,522       95.22       95.22
          2 |        478        4.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017