Classic data set for the choice of class intervals for choropleth maps.

jenks71

Format

A data frame with 102 observations on the following 2 variables.

  • jenks71: a numeric vector: Per acre value of gross farm products in dollars by county for Illinois in #' 1959

  • area: a numeric vector: county area in square miles

Source

Jenks, G. F., Caspall, F. C., 1971. "Error on choroplethic maps: definition, measurement, reduction". Annals, Association of American Geographers, 61 (2), 217–244

Examples

data(jenks71)
jenks71
#>     jenks71      area
#> 1     50.12  619.1250
#> 2     83.90  564.8666
#> 3     76.43  519.2851
#> 4     71.61  470.0023
#> 5     79.66  611.0690
#> 6     84.84  281.9802
#> 7     87.87  763.3878
#> 8     92.45  465.8562
#> 9    119.90  524.0520
#> 10   155.30  957.0728
#> 11   131.50  634.9357
#> 12   111.80  336.5958
#> 13    96.78  697.2824
#> 14    86.75  729.3617
#> 15    62.41  849.4304
#> 16    96.37  322.6725
#> 17    75.51  451.4319
#> 18    77.29 1147.8980
#> 19    85.41  873.4952
#> 20   116.40  825.9242
#> 21    58.50  430.4035
#> 22    75.29  569.4754
#> 23    66.32  172.2371
#> 24    62.65  681.3121
#> 25    80.45  288.2996
#> 26    72.76  720.1658
#> 27    63.67  398.5411
#> 28    60.27 1045.4367
#> 29    68.45  395.4899
#> 30   100.10  543.6524
#> 31    55.30 1117.9663
#> 32    54.07  486.3734
#> 33    57.49  631.0993
#> 34    73.52  542.7184
#> 35    68.25 1186.3229
#> 36    64.28  658.0177
#> 37    50.64  883.1348
#> 38    52.47  815.7020
#> 39    68.19  590.6621
#> 40    57.40  902.1977
#> 41    39.72  563.7366
#> 42    60.66  997.4052
#> 43    57.59  619.1182
#> 44    38.22  441.7262
#> 45    57.22  405.0457
#> 46    67.04  440.3459
#> 47    47.29  872.4719
#> 48    71.05  315.5443
#> 49    50.53  383.6820
#> 50    34.63  307.4830
#> 51    59.65  585.2796
#> 52    62.06  877.4056
#> 53    52.89  624.1747
#> 54    56.35  417.3518
#> 55    57.26  572.6364
#> 56    53.77  849.8499
#> 57    59.89  715.7982
#> 58    55.44  344.4581
#> 59    45.40  252.9370
#> 60    52.21  510.0139
#> 61    49.38  767.9963
#> 62    51.15  709.8996
#> 63    54.27  867.8165
#> 64    54.32  546.7774
#> 65    41.20  504.9391
#> 66    34.58  283.8793
#> 67    50.11  347.0351
#> 68    52.05  377.2332
#> 69    33.82  725.3493
#> 70    39.88  479.8502
#> 71    36.24  446.6893
#> 72    41.02  497.9817
#> 73    46.13  382.7055
#> 74    51.15  740.6097
#> 75    32.28  469.8219
#> 76    33.26  373.2986
#> 77    31.78  362.0195
#> 78    31.28  575.7414
#> 79    50.52  503.4115
#> 80    47.21  674.2223
#> 81    32.69  715.4710
#> 82    38.30  229.4964
#> 83    33.83  222.6388
#> 84    40.30  397.9347
#> 85    40.62  564.3519
#> 86    32.14  583.6990
#> 87    31.66  502.5933
#> 88    26.09  435.8743
#> 89    39.84  597.3510
#> 90    24.83  446.9202
#> 91    28.20  431.3176
#> 92    31.19  602.6493
#> 93    37.57  332.2962
#> 94    27.16  386.9290
#> 95    23.42  444.3156
#> 96    18.57  348.8593
#> 97    30.97  422.1927
#> 98    17.82  374.5757
#> 99    15.57  181.7830
#> 100   15.93  242.0478
#> 101   28.71  252.5336
#> 102   32.22  202.8932