Frequencies for first 10,000 rows of smsares variable in natl1997 dataset :

PSMA/MSA of |
  Residence |
     (NCHS) |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      3,092       30.92       30.92
        003 |          1        0.01       30.93
        011 |          1        0.01       30.94
        012 |        254        2.54       33.48
        016 |          1        0.01       33.49
        030 |         29        0.29       33.78
        032 |      2,162       21.62       55.40
        052 |          1        0.01       55.41
        053 |          2        0.02       55.43
        063 |         74        0.74       56.17
        072 |        336        3.36       59.53
        076 |          1        0.01       59.54
        077 |        299        2.99       62.53
        091 |          1        0.01       62.54
        093 |          1        0.01       62.55
        094 |        273        2.73       65.28
        101 |          1        0.01       65.29
        129 |        793        7.93       73.22
        168 |          1        0.01       73.23
        184 |      1,296       12.96       86.19
        188 |        834        8.34       94.53
        192 |          1        0.01       94.54
        193 |          1        0.01       94.55
        197 |          1        0.01       94.56
        210 |          1        0.01       94.57
        212 |          1        0.01       94.58
        214 |          1        0.01       94.59
        226 |          1        0.01       94.60
        251 |          1        0.01       94.61
        258 |          1        0.01       94.62
        287 |        343        3.43       98.05
        999 |        192        1.92       99.97
        ZZZ |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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