2143 search results for "Map"

Simon Urbanek – R Graphics: supercharged

August 18, 2011
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Simon Urbanek – R Graphics: supercharged

New features: rasterImage() (R2.11) bitmap raster drawing; have maps as data backdrops. Polygons with holes: polypath() -(R2.12) At present there is no way to tell when to actually show the plot. For example: plot(x); lines(x). Should we display the plot after plot or after lines Solution dev.hold() and dev.flush() Better performance and useful for animations –

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Kaleidoscope IIIb (useR! 2011)

August 18, 2011
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Kaleidoscope IIIb (useR! 2011)

O. Mersmann - The microbenchmark package Slides and code (link). SURGEON GENERAL’s WARNING: Microbenchmarks can lead to a distorted view of reality and massive loss of productivity For a higher-order benchmarking package check out the rbenchmark package on R (suggestion from the speaker). Why do we need micro-benchmarking? A simple example showed that it is currently very

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Introduction

August 17, 2011
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Introduction

I’m at the useR! Conference in Coventry, UK, this week. It’s been every bit as inspiring, interesting and useful as I’d hoped. Particularly interesting were the Lightning talks: a series of 5 minute presentations with one minute in between, with each presentation having 15 slides of 20 sec each, moved forward automatically.  It worked extremely

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Programming (useR! 2011)

August 17, 2011
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Programming (useR! 2011)

Ray Brownrigg – Tips and Tricks for young R programmers Problem: Calculate the distribution function of a bivariate Kolomogorov Smirnoff statistic. Essentially three loops. Basic exhaustive search is O(N^3). Fortran gives a single order of magnitude speed-up. Restructuring in R using a single loop is an order faster than fortran. Further improvements make the algorithm

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Jonathan Rougier – Nomograms for visualising relationships between three variables (useR! 2011)

August 16, 2011
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Jonathan Rougier – Nomograms for visualising relationships between three variables (useR! 2011)

Background: Donkeys in Kenya. Tricky to find the weight of a donkey in the “field” – no pun intended! So using a few measurements,  estimate the weight. Other covariates include age. Standard practice is to fit: for adult donkeys, and other slightly different models for young/old and ill donkeys. What can a statistician add: Add

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R Code Examples on Graphics

August 16, 2011
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R Code Examples on Graphics

Some useful R code examples on  graphics are: Learn R Toolkit: It contains PowerPoint slideshows, videos, R scripts and data files to help Excel users move up to R. R code examples are provided for panel charts, conditional format, dot … Continue reading →

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GDAT 2011 in Review

August 13, 2011
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GDAT 2011 in Review

As usual, the Guerrilla Data Analysis Techniques (GDAT) class was a total blast. Motivated students always guarantee that. It would really help our scheduling, however, if people didn't wait until the last nanosecond to register for the class. But give...

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QTL Analysis in R

August 13, 2011
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QTL Analysis in R

See also: Part 1: QTL Analysis and Quantitative Genetics  Part 2: Statistical Methods for QTL Analysis The 'qtl' package in R allows you to implement QTL analysis using the methods I've previously discussed. The code below is adapted from Broman...

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FastCompany on telling stories with data

August 11, 2011
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An article in FastCompany today profiles two websites that excel in telling engaging stories with data: the FlowingData and OkTrends blogs. Both sites often use R for data analysis and data visualization, and have been featured here on this blog. FlowingData regularly posts guides on how to use R to recreate many of its featured visualizations with bubble charts,...

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Analysis of Japanese Earthquakes Data

August 10, 2011
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Analysis of Japanese Earthquakes Data

Latest version is here.Greater attention is much more about earthquakes, Touhoku earthquake has occurred on March 11, 2011. Earthquake data are released at Japan Weather Association's Tenki.jp. We can get these variables from the site.Date, TimeAreaLat...

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