Frequencies for first 10,000 rows of ssamsasz variable in posclia2006 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,834       28.34       28.34
          A |          2        0.02       28.36
          B |      2,112       21.12       49.48
          C |      2,033       20.33       69.81
          D |      1,473       14.73       84.54
          E |      1,441       14.41       98.95
          F |        105        1.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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