2738 search results for "gis"

Sensual marimba sunspots

February 25, 2012
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Here's the numbers of yearly sunspots, 1700-1988, brought to you by the nimble marimba of R: See ?sunspot.year in R for more information about the data. I did this last spring and just discovered it again. I've been so caught up in the current sound world of playitbyr (see this post for an example) that

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Webinar Wednesday: Introduction to Revolution R Enterprise

February 21, 2012
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If you haven't yet had a chance to catch my regularly-scheduled webinar, "Revolution R Enterprise - 100% R and More", it's a quick 30-minute introduction to the R language and the added features of Revolution R Enterprise. It's also a chance to ask me any questions you might have about R or Revolution Analytics during the live broadcast (starts...

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Simplifying spatial polygons in R

February 20, 2012
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Simplifying spatial polygons in R

Polygon simplification is something others have written about, using R packages such as shapefiles. This explores how package ‘rgeos’ uses the Ramer–Douglas–Peucker algorithm, a method commonly used in GIS systems for simplifying shapefiles. It works by imposing a deviation tolerance … Continue reading →

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Course: Statistical Practice in Epidemiology with R

February 17, 2012
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Course: Statistical Practice in Epidemiology with R

Statistical Practice in Epidemiology with R is a one week course aimed at promoting the use of R among epidemiologists.  This annual course has been running almost every year since 2004. Last year it took place in Lyon, France, but … Continue reading →

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draw chinese character Jiong using ggplot2

February 17, 2012
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draw chinese character Jiong using ggplot2

The Chinese character Jiong (囧) is now widely used for expressing ideas or feelings such as annoyance, shock, embarrassment, awkwardness, scorn. The function plot of y=1/(x^2-1) looks very similar of this symbol. I use ggplot2 to draw the symbol of Jiong. Read More: 359 Words Totally

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Take the INNGE survey on math and ecology

February 17, 2012
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Many ecologists are R users, but we vary in our understanding of the math and statistical theory behind models we use. There is no clear consensus on what should be the basic mathematical training of ecologists. To learn what the community thinks, we ...

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Reshaping the IT world

February 16, 2012
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Reshaping the IT world

During my university time I worked on the IT help desk for a while. One day I received a call from a professor, who said that his printer had stopped working. So I asked him, if there was a message on the display and if he could read it to me. "Oh yes"...

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Generating Twitter Wordclouds in R (Prompted by an Open Learning Blogpost)

February 15, 2012
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Generating Twitter Wordclouds in R (Prompted by an Open Learning Blogpost)

A couple of weeks ago I saw a great example of an open learning blogpost from @katy_bird: Generating a word cloud (or not) from a Twitter hashtag. It described the trials and tribulations associated with trying to satisfy a request for the generation of a wordcloud based on tweets associated with a specific Twitter hashtag.

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If you have to use circles…

February 15, 2012
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If you have to use circles…

Stats Chat is an interesting kiwi site—managed by the Department of Statistics of the University of Auckland—that centers around the use and presentation of statistics in the media. This week there was an interesting discussion on one of those infographics … Continue reading →

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Pricing defaultable discount bond with reduced form model

February 14, 2012
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Pricing defaultable discount bond with reduced form model

I often use R language to write "prototype" program. As you know, It has very high productivity and smart grammar. In this article, I would like to show you how to write the program to evaluate the price of defaultable bond by "reduced-form model".Before write a program, we need to understand how to price these bond.Under risk neutral measure, we can...

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