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

     county |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        195        1.95        1.95
          3 |        232        2.32        4.27
          5 |        225        2.25        6.52
          7 |        143        1.43        7.95
          9 |        104        1.04        8.99
         11 |         31        0.31        9.30
         12 |         27        0.27        9.57
         13 |      1,360       13.60       23.17
         15 |        221        2.21       25.38
         17 |        144        1.44       26.82
         19 |        512        5.12       31.94
         20 |         68        0.68       32.62
         21 |        272        2.72       35.34
         23 |         73        0.73       36.07
         25 |        203        2.03       38.10
         27 |        115        1.15       39.25
         29 |        156        1.56       40.81
         31 |         95        0.95       41.76
         33 |         91        0.91       42.67
         35 |         61        0.61       43.28
         37 |        680        6.80       50.08
         39 |         82        0.82       50.90
         41 |         19        0.19       51.09
         43 |        114        1.14       52.23
         45 |         91        0.91       53.14
         47 |         65        0.65       53.79
         49 |         37        0.37       54.16
         51 |        110        1.10       55.26
         53 |         68        0.68       55.94
         55 |         79        0.79       56.73
         57 |         29        0.29       57.02
         59 |        225        2.25       59.27
         60 |          3        0.03       59.30
         61 |         44        0.44       59.74
         63 |         64        0.64       60.38
         65 |        234        2.34       62.72
         67 |        166        1.66       64.38
         69 |        100        1.00       65.38
         71 |        296        2.96       68.34
         73 |        461        4.61       72.95
         75 |         60        0.60       73.55
         77 |        124        1.24       74.79
         79 |         58        0.58       75.37
         81 |         76        0.76       76.13
         83 |         62        0.62       76.75
         85 |        149        1.49       78.24
         87 |         45        0.45       78.69
         89 |        159        1.59       80.28
         90 |         23        0.23       80.51
         91 |         33        0.33       80.84
         93 |         66        0.66       81.50
         95 |        109        1.09       82.59
         97 |        244        2.44       85.03
         99 |         66        0.66       85.69
        101 |         66        0.66       86.35
        103 |        102        1.02       87.37
        105 |         15        0.15       87.52
        107 |        104        1.04       88.56
        109 |         36        0.36       88.92
        110 |          5        0.05       88.97
        111 |         56        0.56       89.53
        113 |         61        0.61       90.14
        115 |         87        0.87       91.01
        117 |         78        0.78       91.79
        119 |        185        1.85       93.64
        121 |         55        0.55       94.19
        122 |         27        0.27       94.46
        123 |         47        0.47       94.93
        125 |        117        1.17       96.10
        127 |         76        0.76       96.86
        129 |         16        0.16       97.02
        130 |          1        0.01       97.03
        131 |         51        0.51       97.54
        133 |         40        0.40       97.94
        135 |          1        0.01       97.95
        137 |         11        0.11       98.06
        139 |         26        0.26       98.32
        141 |         10        0.10       98.42
        143 |         43        0.43       98.85
        145 |         18        0.18       99.03
        147 |          5        0.05       99.08
        149 |          9        0.09       99.17
        164 |          2        0.02       99.19
        170 |         40        0.40       99.59
        180 |          4        0.04       99.63
        185 |          1        0.01       99.64
        188 |          5        0.05       99.69
        201 |          5        0.05       99.74
        240 |          6        0.06       99.80
        261 |          7        0.07       99.87
        280 |          1        0.01       99.88
        290 |          9        0.09       99.97
        999 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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