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

     county |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          7        0.07        0.07
          1 |        246        2.46        2.53
          3 |        187        1.87        4.40
          5 |        199        1.99        6.39
          7 |        135        1.35        7.74
          9 |         74        0.74        8.48
         11 |         32        0.32        8.80
         12 |         52        0.52        9.32
         13 |      1,274       12.74       22.06
         15 |        245        2.45       24.51
         17 |        183        1.83       26.34
         19 |        458        4.58       30.92
         20 |         46        0.46       31.38
         21 |        266        2.66       34.04
         23 |         30        0.30       34.34
         25 |        182        1.82       36.16
         27 |        123        1.23       37.39
         29 |        144        1.44       38.83
         31 |        113        1.13       39.96
         33 |         48        0.48       40.44
         35 |         90        0.90       41.34
         37 |        788        7.88       49.22
         39 |         51        0.51       49.73
         41 |         16        0.16       49.89
         43 |         54        0.54       50.43
         45 |        107        1.07       51.50
         47 |         79        0.79       52.29
         49 |         62        0.62       52.91
         51 |         90        0.90       53.81
         53 |         84        0.84       54.65
         55 |         63        0.63       55.28
         57 |         78        0.78       56.06
         59 |        177        1.77       57.83
         61 |         67        0.67       58.50
         63 |         36        0.36       58.86
         65 |        217        2.17       61.03
         67 |         81        0.81       61.84
         69 |         92        0.92       62.76
         70 |          2        0.02       62.78
         71 |        335        3.35       66.13
         73 |        401        4.01       70.14
         75 |         53        0.53       70.67
         77 |        169        1.69       72.36
         79 |         71        0.71       73.07
         81 |        116        1.16       74.23
         83 |         74        0.74       74.97
         85 |        131        1.31       76.28
         87 |         31        0.31       76.59
         89 |         85        0.85       77.44
         90 |         20        0.20       77.64
         91 |         51        0.51       78.15
         93 |         69        0.69       78.84
         95 |        112        1.12       79.96
         97 |        268        2.68       82.64
         99 |         76        0.76       83.40
        100 |          1        0.01       83.41
        101 |        114        1.14       84.55
        103 |         84        0.84       85.39
        105 |         27        0.27       85.66
        107 |         84        0.84       86.50
        109 |         76        0.76       87.26
        110 |          6        0.06       87.32
        111 |         80        0.80       88.12
        113 |        112        1.12       89.24
        115 |         90        0.90       90.14
        117 |         49        0.49       90.63
        119 |        151        1.51       92.14
        121 |         70        0.70       92.84
        122 |         28        0.28       93.12
        123 |         52        0.52       93.64
        125 |        102        1.02       94.66
        127 |         62        0.62       95.28
        129 |         36        0.36       95.64
        130 |          6        0.06       95.70
        131 |         39        0.39       96.09
        133 |         53        0.53       96.62
        135 |         44        0.44       97.06
        137 |          2        0.02       97.08
        139 |         37        0.37       97.45
        141 |          8        0.08       97.53
        143 |         82        0.82       98.35
        145 |         50        0.50       98.85
        147 |          7        0.07       98.92
        149 |         13        0.13       99.05
        150 |          2        0.02       99.07
        170 |         37        0.37       99.44
        180 |         13        0.13       99.57
        185 |          1        0.01       99.58
        188 |          2        0.02       99.60
        220 |          3        0.03       99.63
        231 |          5        0.05       99.68
        240 |          2        0.02       99.70
        261 |         14        0.14       99.84
        290 |          9        0.09       99.93
        999 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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