2006 search results for "Map"

MCMC and faster Gibbs Sampling using Rcpp

July 14, 2011
By

Sanjog Misra, who uses Rcpp for Monte Carlo Markov Chain (MCMC) analyses in quantitative marketing, kindly set me a short example of Rcpp use.The example is based on a blog post by Darren Wilkinson which itself discusses and compares the suitabilit...

Read more »

Paul Murrell on Incorporating Images in R Charts

July 13, 2011
By
Paul Murrell on Incorporating Images in R Charts

Thanks to everyone at who attended last night's Bay Area R User Group meeting, and a special thanks to our hosts Socialize (a company that makes a mobile SDK for application developers that increases user engagement) who were very generous in letting the group use their San Francisco digs for the meeting. Reflexive thanks also go to the Revolution...

Read more »

In case you missed it: June Roundup

July 11, 2011
By

In case you missed them, here are some articles from June of particular interest to R users. Highlights of presentations from the R/Finance 2011 conference. Trulia uses R and statistical models to map local crime. Resources for data mining with R. K-means clustering on large data sets with the RevoScaleR package. Revolution Analytics' CTO David Champagne writes on real-time...

Read more »

Creating 3D geographical plots in R using RGL

July 11, 2011
By
Creating 3D geographical plots in R using RGL

I've been playing around with the rgl package in the last week, as part of an ongoing quest to come up with nice-looking (but more importantly, useful) data vizualisations. It's a nice little package, and once you've run through the excell...

Read more »

Migrating from SPSS/Excel to R

July 10, 2011
By
Migrating from SPSS/Excel to R

In this post, I give an outline for those interested in migrating from using SPSS and Excel for data processing/analysis …Continue reading »

Read more »

High-quality R graphics on the Web with SVG

July 7, 2011
By
High-quality R graphics on the Web with SVG

If you want the graphics you create with R to look their best, in general it's best to go for a vector-based graphics format instead of a raster-based format. Common formats like GIF and JPG are raster-based: the image is composed of pixels, and if you don't choose a high enough resolution, you're likely to lose fine details and/or...

Read more »

Descriptive statistics, causal inference, and story time

July 7, 2011
By

Dave Backus points me to this review by anthropologist Mike McGovern of two books by economist Paul Collier on the politics of economic development in Africa. My first reaction was that this was interesting but non-statistical so I’d have to either post it on the sister blog or wait until the 30 days of statistics

Read more »

Example 9.1: Scatterplots with binning for large datasets

July 5, 2011
By
Example 9.1: Scatterplots with binning for large datasets

Scatterplots can get very hard to interpret when displaying large datasets, as points inevitably overplot and can't be individually discerned. A number of approaches have been crafted to help with this problem. One approach uses binning. This approa...

Read more »

Different goals, different looks: Infovis and the Chris Rock effect

July 5, 2011
By
Different goals, different looks:  Infovis and the Chris Rock effect

Seth writes: Here’s my candidate for bad graphic of the year: I studied it and learned nothing. I have no idea how they assigned colors to locations. I already knew that there were more within-city calls than calls to individual distant locations — for example that there are more SF-SF calls than SF-LA calls.

Read more »

GIS on a shoestring – Getting traveltimes from google

July 2, 2011
By

The analysis of geospatial information is currently a big trend in medicine and public health. Even though some may want to convince you that this can only be achieved with the latest and most expensive software, I am not convinced. First, analysis  of spatial data dates back to at least 1856 when John Snow investigated

Read more »