Frequencies for first 10,000 rows of ssamsasz variable in pos2001 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,778       27.78       27.78
          A |      1,521       15.21       42.99
          B |      2,840       28.40       71.39
          C |        774        7.74       79.13
          D |      1,203       12.03       91.16
          E |        746        7.46       98.62
          F |        138        1.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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