Frequencies for first 10,000 rows of smsares variable in natlterr1994 dataset :

PSMA/MSA of |
  Residence |
     (NCHS) |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      1,653       16.53       16.53
        001 |        358        3.58       20.11
        002 |        413        4.13       24.24
        003 |        782        7.82       32.06
        004 |        639        6.39       38.45
        005 |      1,081       10.81       49.26
        006 |      5,066       50.66       99.92
        999 |          4        0.04       99.96
        ZZZ |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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