Frequencies for first 10,000 rows of smsares variable in natl1981 dataset :

   Standard |
Metropolita |
          n |
Statistical |
  Area SMSA |
         of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      3,977       39.77       39.77
        003 |          1        0.01       39.78
        012 |          1        0.01       39.79
        015 |        419        4.19       43.98
        019 |          1        0.01       43.99
        035 |      2,142       21.42       65.41
        057 |         13        0.13       65.54
        066 |         70        0.70       66.24
        093 |        402        4.02       70.26
        099 |          4        0.04       70.30
        102 |        251        2.51       72.81
        122 |        839        8.39       81.20
        137 |          1        0.01       81.21
        177 |      1,023       10.23       91.44
        180 |        566        5.66       97.10
        207 |          1        0.01       97.11
        209 |         13        0.13       97.24
        283 |        275        2.75       99.99
        ZZZ |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016