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

     county |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        311        3.11        3.11
          3 |        291        2.91        6.02
          5 |        203        2.03        8.05
          7 |        126        1.26        9.31
          9 |        113        1.13       10.44
         11 |         27        0.27       10.71
         12 |         76        0.76       11.47
         13 |      1,235       12.35       23.82
         15 |        191        1.91       25.73
         16 |          1        0.01       25.74
         17 |        153        1.53       27.27
         19 |        543        5.43       32.70
         20 |         83        0.83       33.53
         21 |        263        2.63       36.16
         23 |         49        0.49       36.65
         25 |        279        2.79       39.44
         27 |        120        1.20       40.64
         29 |        156        1.56       42.20
         31 |         47        0.47       42.67
         33 |         61        0.61       43.28
         35 |         65        0.65       43.93
         37 |        570        5.70       49.63
         39 |         58        0.58       50.21
         41 |         24        0.24       50.45
         43 |         59        0.59       51.04
         45 |         71        0.71       51.75
         47 |         64        0.64       52.39
         49 |         69        0.69       53.08
         51 |         51        0.51       53.59
         53 |         70        0.70       54.29
         55 |         69        0.69       54.98
         57 |         59        0.59       55.57
         59 |        187        1.87       57.44
         61 |         29        0.29       57.73
         63 |         35        0.35       58.08
         65 |        296        2.96       61.04
         67 |        130        1.30       62.34
         68 |          4        0.04       62.38
         69 |         69        0.69       63.07
         70 |          4        0.04       63.11
         71 |        402        4.02       67.13
         73 |        414        4.14       71.27
         75 |         76        0.76       72.03
         77 |        142        1.42       73.45
         79 |         58        0.58       74.03
         81 |        109        1.09       75.12
         83 |         40        0.40       75.52
         85 |        153        1.53       77.05
         87 |         73        0.73       77.78
         89 |        154        1.54       79.32
         90 |         34        0.34       79.66
         91 |         53        0.53       80.19
         93 |         54        0.54       80.73
         95 |        132        1.32       82.05
         97 |        224        2.24       84.29
         99 |         52        0.52       84.81
        100 |          1        0.01       84.82
        101 |        133        1.33       86.15
        103 |         66        0.66       86.81
        105 |         26        0.26       87.07
        107 |        113        1.13       88.20
        109 |         33        0.33       88.53
        110 |          7        0.07       88.60
        111 |         81        0.81       89.41
        113 |         91        0.91       90.32
        115 |         83        0.83       91.15
        117 |         66        0.66       91.81
        119 |        148        1.48       93.29
        121 |         59        0.59       93.88
        122 |         34        0.34       94.22
        123 |         48        0.48       94.70
        125 |        115        1.15       95.85
        127 |         82        0.82       96.67
        129 |         45        0.45       97.12
        130 |          1        0.01       97.13
        131 |         40        0.40       97.53
        133 |         24        0.24       97.77
        135 |         13        0.13       97.90
        137 |          6        0.06       97.96
        139 |         31        0.31       98.27
        141 |         11        0.11       98.38
        143 |         47        0.47       98.85
        145 |         35        0.35       99.20
        147 |          4        0.04       99.24
        149 |          2        0.02       99.26
        164 |          2        0.02       99.28
        170 |         21        0.21       99.49
        180 |          2        0.02       99.51
        185 |          9        0.09       99.60
        261 |         18        0.18       99.78
        270 |          3        0.03       99.81
        280 |          5        0.05       99.86
        290 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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