Frequencies for first 10,000 rows of ssamsasz variable in pos2006 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,084       30.84       30.84
          A |      1,400       14.00       44.84
          B |      2,567       25.67       70.51
          C |        803        8.03       78.54
          D |      1,194       11.94       90.48
          E |        800        8.00       98.48
          F |        152        1.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016