Frequencies for first 10,000 rows of county variable in person dataset :

     County |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        204        2.04        2.04
          3 |        132        1.32        3.36
          5 |        135        1.35        4.71
          7 |        132        1.32        6.03
          9 |         66        0.66        6.69
         11 |         43        0.43        7.12
         12 |         73        0.73        7.85
         13 |        935        9.35       17.20
         15 |        194        1.94       19.14
         17 |        113        1.13       20.27
         19 |        465        4.65       24.92
         20 |         49        0.49       25.41
         21 |        256        2.56       27.97
         23 |         81        0.81       28.78
         25 |        180        1.80       30.58
         27 |         97        0.97       31.55
         29 |        167        1.67       33.22
         31 |         88        0.88       34.10
         33 |         62        0.62       34.72
         35 |         49        0.49       35.21
         37 |        905        9.05       44.26
         39 |         55        0.55       44.81
         41 |         25        0.25       45.06
         43 |         76        0.76       45.82
         45 |         78        0.78       46.60
         47 |        113        1.13       47.73
         49 |         20        0.20       47.93
         51 |         62        0.62       48.55
         53 |        131        1.31       49.86
         55 |         56        0.56       50.42
         57 |         42        0.42       50.84
         59 |        278        2.78       53.62
         61 |         60        0.60       54.22
         63 |         37        0.37       54.59
         65 |        309        3.09       57.68
         67 |        211        2.11       59.79
         68 |          2        0.02       59.81
         69 |         75        0.75       60.56
         70 |          2        0.02       60.58
         71 |        517        5.17       65.75
         73 |        552        5.52       71.27
         75 |         66        0.66       71.93
         77 |        178        1.78       73.71
         79 |         69        0.69       74.40
         81 |        122        1.22       75.62
         83 |        109        1.09       76.71
         85 |        146        1.46       78.17
         87 |         26        0.26       78.43
         89 |        138        1.38       79.81
         90 |         15        0.15       79.96
         91 |         50        0.50       80.46
         93 |         39        0.39       80.85
         95 |        104        1.04       81.89
         97 |        201        2.01       83.90
         99 |        127        1.27       85.17
        100 |          1        0.01       85.18
        101 |        122        1.22       86.40
        103 |         86        0.86       87.26
        105 |         34        0.34       87.60
        107 |        155        1.55       89.15
        109 |         28        0.28       89.43
        110 |          5        0.05       89.48
        111 |        145        1.45       90.93
        113 |         86        0.86       91.79
        115 |         66        0.66       92.45
        117 |         57        0.57       93.02
        119 |        159        1.59       94.61
        121 |         42        0.42       95.03
        122 |         54        0.54       95.57
        123 |         26        0.26       95.83
        125 |         96        0.96       96.79
        127 |         62        0.62       97.41
        129 |         21        0.21       97.62
        131 |         34        0.34       97.96
        133 |         16        0.16       98.12
        135 |          8        0.08       98.20
        137 |          7        0.07       98.27
        139 |         13        0.13       98.40
        141 |         20        0.20       98.60
        143 |         56        0.56       99.16
        145 |         17        0.17       99.33
        147 |          8        0.08       99.41
        149 |          5        0.05       99.46
        150 |          7        0.07       99.53
        164 |          1        0.01       99.54
        170 |         18        0.18       99.72
        180 |         11        0.11       99.83
        188 |          2        0.02       99.85
        240 |          5        0.05       99.90
        270 |          2        0.02       99.92
        290 |          4        0.04       99.96
        999 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016