Frequencies for first 10,000 rows of ssamsasz variable in pos1988 dataset :

  SMSA Size |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,028       20.28       20.28
          A |      3,165       31.65       51.93
          B |      2,450       24.50       76.43
          C |        602        6.02       82.45
          D |      1,096       10.96       93.41
          E |        645        6.45       99.86
          F |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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