NCGA GeoMath Lesson North Carolina Geographic Alliance 2014

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Presentation transcript:

NCGA GeoMath Lesson North Carolina Geographic Alliance 2014 Choropleth Map NCGA GeoMath Lesson North Carolina Geographic Alliance 2014

How can such different looking maps show the same variable? Cartographic reasons Different slicing values Different levels of spatial aggregation Geographical reasons Uneven distribution of minorities at the state scale as well as at the national scale Concentration of minorities in cities, particularly in northern states www.utexas.edu/depts/grg/adams/305/maps.ppt‎ 2

Percent of Population White (not Hispanic)

Different ways of “slicing” data The Data {42, 50, 55, 57, 61, 77, 79, 97} Equal interval Three classes based on range 40 to 100 {42, 50, 55, 57} {61, 77, 79} {97} Quantile Quartiles (lowest 1/4 of observations, next 1/4, …) {42, 50} {55, 57} {61, 77} {79, 97}

Different ways of “slicing” data Natural breaks {428505552574616772791897} {42} {50, 55, 57, 61} {77, 79} {97} Standard deviations Mean = 64.75, Std. Dev. = 15.977

Natural Breaks

Equal Interval

Quintiles (quantiles based on division into 5 classes)

Quintiles Natural Breaks Equal Interval

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