578 search results for "spatial"

Correction For Spatial And Temporal Auto-Correlation In Panel Data: Using R To Estimate Spatial HAC Errors Per Conley

September 2, 2015
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Correction For Spatial And Temporal Auto-Correlation In Panel Data: Using R To Estimate Spatial HAC Errors Per Conley

Darin Christensen and Thiemo Fetzer tl;dr: Fast computation of standard errors that allows for serial and spatial auto-correlation. Economists and political scientists often employ panel data that track units (e.g., firms or villages) over time. When estimating regression models using such data, we often need to be concerned about two forms of auto-correlation: serial (within … Continue reading...

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R courses on basic R, advanced R, statistical machine learning with R, text mining with R, spatial modelling with R and R package building

R courses on basic R, advanced R, statistical machine learning with R, text mining with R, spatial modelling with R and R package building

Waw, our course list for teaching R is getting bigger and bigger. We have now courses on basic, R, advanced R, R package building, statistical machine learning with R, text mining with R and spatial analysis with R. All face-to-face courses given in ...

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ImageJ Selections to Georeferenced Spatial Objects

August 5, 2015
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ImageJ Selections to Georeferenced Spatial Objects

05.08.2015 As a result of the last UseR conference and some great spatial workshops and talks where I participated I decided to rework the selection dialog for the upcoming Bio7 2.3 to transfer ImageJ selection data as ‘Spatial Objects’ with the help of the package ‘sp‘ and the Java GDAL binding (version 1.7.1). Video: One

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mapView: basic interactive viewing of spatial data in R

July 24, 2015
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mapView: basic interactive viewing of spatial data in R

Working with spatial data in R I find myself quite often in the need to quickly visually check whether a certain analysis has produced reasonable results. There are two ways I usually do this. Either I: (sp)plot the data in … Continue reading →

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MazamaSpatialUtils — Ebola Map Example

July 14, 2015
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MazamaSpatialUtils — Ebola Map Example

This entry is part 16 of 16 in the series Using R The MazamaSpatialUtils package on CRAN has just been updated with additional shape file conversion scripts and location buffering so that points located just outside of polygons (i.e. coastal …   read more ...

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Stop and Frisk: Spatial Analysis of Racial Discrepancies

June 23, 2015
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Stop and Frisk: Spatial Analysis of Racial Discrepancies

In my last post, I compiled and cleaned publicly available data on over 4.5 million stops over the past 11 years. I also presented preliminary summary statistics showing that blacks had been consistently stopped 3-6 times more than whites over the last decade in NYC. Since the last post, I managed to clean and reformat the … Continue reading...

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Plotting spatial neighbors in ggmap

June 15, 2015
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Plotting spatial neighbors in ggmap

The R package spdep has great utilities to define spatial neighbors (e.g. dnearneigh, knearneigh, with a nice vignette to boot), but the plotting functionality is aimed at base graphics. If you’re hoping to plot spatial neighborhoods as line segments in ggplot2, or ggmap, you’ll need the neighborhood data to be stored in a data frame. So, to...

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MazamaSpatialUtils Package

February 11, 2015
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MazamaSpatialUtils Package

This entry is part 15 of 15 in the series Using RMazama Science has just released its first package on CRAN — MazamaSpatialUtils. Here is the description: A suite of conversion scripts to create internally standardized spatial polygons dataframes. Utility …   read more ...

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Spatial, age and sex structured population simulation in R with arrays

January 22, 2015
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In this post I’ll outline why and how I use arrays as the main data structure in a population simulation which represents the age, sex and spatial location of tsetse flies in the landscape. An earlier post outlines the background to this tsetse population simulation. I wanted a data structure that would make it easy and transparent for me...

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Spatial visualization with R – Tutorial

December 10, 2014
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Spatial visualization with R – Tutorial

The visualization of spatial data is one of the most popular applications when using R. This tutorial is an introduction to the visualization of spatial data and map making in R. The following issues will be addressed: Import anduse of shapefiles in R (shapefile is a file format designed for spatial data). Data management and

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