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Speaking Stata: Smoothing in various directions AgEcon
Cox, Nicholas J..
Identifying patterns in bivariate data on a scatterplot remains a basic statistical problem, with special avor when both variables are on the same footing. Ideas of double, diagonal, and polar smoothing inspired by Cleveland and McGill’s 1984 paper in the Journal of the American Statistical Association are revisited with various examples from environmental datasets. Double smoothing means smoothing both y given x and x given y. Diagonal smoothing means smoothing based on the sum and difference of y and x that treats the two variables symmetrically, possibly under standardization. Polar smoothing is based on the transformation from Cartesian to polar coordinates followed by smoothing and then reverse transformation; here the smoothing is implemented by...
Tipo: Journal Article Palavras-chave: Exploratory data analysis; Statistical graphics; Bivariate data; Double smoothing; Doublesm; Diagonal smoothing; Diagsm; Polar smoothing; Polarsm; Research Methods/ Statistical Methods.
Ano: 2005 URL: http://purl.umn.edu/117548
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Using density-distribution sunflower plots to explore bivariate relationships in dense data AgEcon
Dupont, William D.; Plummer, W. Dale, Jr..
Density-distribution sunflower plots are used to display high-density bivariate data. They are useful for data where a conventional scatterplot is difficult to read due to overstriking of the plot symbol. The x–y plane is subdivided into a lattice of small, regular, hexagonal bins. These bins are divided into low-, medium-, and high-density groups. In low-density bins, the individual observations are plotted as in a conventional scatterplot. Medium- and high-density bins contain light and dark sunflowers, respectively. In a light sunflower, each petal represents one observation. In a dark sunflower, each petal represents a specific number of observations. The user can control the sizes and colors of the sunflowers. By selecting appropriate colors and sizes...
Tipo: Journal Article Palavras-chave: Scatterplot; Sunflower plot; Bivariate data; Density plot; Probability density function; Graphical statistics; Research Methods/ Statistical Methods.
Ano: 2005 URL: http://purl.umn.edu/117526
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