Frequencies for first 10,000 rows of smsares variable in natlterr2001 dataset :

PSMA/MSA of |
  Residence |
     (NCHS) |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      1,654       16.54       16.54
        001 |        367        3.67       20.21
        002 |        452        4.52       24.73
        003 |        812        8.12       32.85
        004 |        591        5.91       38.76
        005 |      1,053       10.53       49.29
        006 |      5,051       50.51       99.80
        999 |          9        0.09       99.89
        ZZZ |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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