Frequencies for first 10,000 rows of popsmas variable in natl1997 dataset :

   PMSA/MSA |
 Population |
       Size |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,204       52.04       52.04
          2 |      1,509       15.09       67.13
          9 |      3,284       32.84       99.97
          Z |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015