Frequencies for first 10,000 rows of smsares variable in natlterr1998 dataset :

PSMA/MSA of |
  Residence |
     (NCHS) |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      1,568       15.68       15.68
        001 |        372        3.72       19.40
        002 |        448        4.48       23.88
        003 |        778        7.78       31.66
        004 |        601        6.01       37.67
        005 |      1,068       10.68       48.35
        006 |      5,156       51.56       99.91
        999 |          4        0.04       99.95
        ZZZ |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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