Frequencies for first 10,000 rows of popsmas variable in natl1990 dataset :

   PMSA/MSA |
 Population |
       Size |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,070       40.70       40.70
          2 |      2,374       23.74       64.44
          9 |      3,554       35.54       99.98
          Z |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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