Frequencies for first 10,000 rows of cntyres variable in natl1998 dataset :

NCHS County |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
      01008 |        266        2.66        2.66
      01037 |      1,507       15.07       17.73
      01045 |        673        6.73       24.46
      01049 |      1,084       10.84       35.30
      01051 |        589        5.89       41.19
      01052 |        268        2.68       43.87
      01063 |        355        3.55       47.42
      01999 |      5,117       51.17       98.59
      05048 |          2        0.02       98.61
      10003 |          1        0.01       98.62
      10017 |          1        0.01       98.63
      10037 |          1        0.01       98.64
      10046 |          1        0.01       98.65
      10052 |          1        0.01       98.66
      10999 |         25        0.25       98.91
      11999 |         16        0.16       99.07
      15049 |          1        0.01       99.08
      25024 |          1        0.01       99.09
      25030 |         22        0.22       99.31
      25999 |         30        0.30       99.61
      34026 |          1        0.01       99.62
      36047 |          1        0.01       99.63
      36057 |          1        0.01       99.64
      43075 |          1        0.01       99.65
      43999 |         33        0.33       99.98
      47999 |          1        0.01       99.99
      48032 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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