Frequencies for first 10,000 rows of smsarfip variable in natl1990 dataset :

  FIPS SMSA |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      3,334       33.34       33.34
       0450 |        233        2.33       35.67
       0520 |          4        0.04       35.71
       0600 |          1        0.01       35.72
       0720 |          1        0.01       35.73
       0920 |          2        0.02       35.75
       1000 |      2,410       24.10       59.85
       1800 |         35        0.35       60.20
       2030 |        265        2.65       62.85
       2180 |        386        3.86       66.71
       2320 |          2        0.02       66.73
       2650 |        324        3.24       69.97
       2700 |          1        0.01       69.98
       2750 |          1        0.01       69.99
       3440 |        851        8.51       78.50
       3600 |          2        0.02       78.52
       3880 |          1        0.01       78.53
       5160 |        534        5.34       83.87
       5190 |          1        0.01       83.88
       5240 |      1,107       11.07       94.95
       6015 |          2        0.02       94.97
       6025 |          3        0.03       95.00
       6080 |          2        0.02       95.02
       7040 |          1        0.01       95.03
       7560 |          1        0.01       95.04
       8560 |          1        0.01       95.05
       8600 |        269        2.69       97.74
       8840 |          1        0.01       97.75
       9000 |          1        0.01       97.76
       9040 |          1        0.01       97.77
       9200 |          1        0.01       97.78
       9999 |        222        2.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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