Frequencies for first 10,000 rows of ssamsasz variable in pos2005 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,030       30.30       30.30
          A |      1,438       14.38       44.68
          B |      2,608       26.08       70.76
          C |        794        7.94       78.70
          D |      1,189       11.89       90.59
          E |        795        7.95       98.54
          F |        146        1.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017