jenks71 {spData} | R Documentation |
Illinois 1959 county gross farm product value per acre
Description
Classic data set for the choice of class intervals for choropleth maps.
Usage
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 #' 1959area
: 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
[Package spData version 2.3.1 Index]