Frequencies for first 10,000 rows of smsares variable in natlterr1999 dataset :

PSMA/MSA of |
  Residence |
     (NCHS) |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      1,674       16.74       16.74
        001 |        357        3.57       20.31
        002 |        432        4.32       24.63
        003 |        806        8.06       32.69
        004 |        621        6.21       38.90
        005 |      1,022       10.22       49.12
        006 |      5,077       50.77       99.89
        999 |          8        0.08       99.97
        ZZZ |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015