Frequencies for first 10,000 rows of msa variable in nhamcsopd2001 dataset :

      visit |
occurred in |
     msa or |
    non-msa |
   location |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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