Frequencies for first 10,000 rows of ssamsasz variable in pos2003 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,898       28.98       28.98
          A |      1,549       15.49       44.47
          B |      2,694       26.94       71.41
          C |        772        7.72       79.13
          D |      1,168       11.68       90.81
          E |        773        7.73       98.54
          F |        146        1.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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