Frequencies for first 10,000 rows of ssamsasz variable in pos1995 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,481       24.81       24.81
          A |      1,537       15.37       40.18
          B |      3,058       30.58       70.76
          C |        852        8.52       79.28
          D |      1,189       11.89       91.17
          E |        758        7.58       98.75
          F |        125        1.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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