Frequencies for first 10,000 rows of smsares variable in natlterr1996 dataset :

PSMA/MSA of |
  Residence |
     (NCHS) |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      1,668       16.68       16.68
        001 |        352        3.52       20.20
        002 |        414        4.14       24.34
        003 |        784        7.84       32.18
        004 |        661        6.61       38.79
        005 |      1,059       10.59       49.38
        006 |      5,051       50.51       99.89
        999 |          6        0.06       99.95
        ZZZ |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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