Frequencies for first 10,000 rows of ssamsasz variable in pos2000 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,714       27.14       27.14
          A |      1,531       15.31       42.45
          B |      2,899       28.99       71.44
          C |        787        7.87       79.31
          D |      1,200       12.00       91.31
          E |        733        7.33       98.64
          F |        136        1.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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