2634 search results for "GIS"

Simplest possible heatmap with ggplot2

September 27, 2012
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Simplest possible heatmap with ggplot2

Featuring the lovely “spectral” palette from Colorbrewer. This really just serves as a reminder of how to do four things I frequently want to do: Make a heatmap of some kind of matrix, often a square correlation matrix Reorder a factor vari...

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structure and uncertainty, Bristol, Sept. 26

September 26, 2012
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structure and uncertainty, Bristol, Sept. 26

Another day full of interesting and challenging—in the sense they generated new questions for me—talks at the SuSTain workshop. After another (dry and fast) run around the Downs; Leo Held started the talks with one of my favourite topics, namely the theory of g-priors in generalized linear models. He did bring a new perspective on

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Modifying select off-diagonal items in a matrix

September 25, 2012
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This is something I have had the occasion to do, and never remember how, so this is legitimately a reminder to my future self of how to do things with off-diagonal elements of a matrix. Select rows and columns are easy: mat or mat, for...

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Two particular courses and other upcoming events

September 25, 2012
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Two particular courses and other upcoming events

Featured I’ll be leading two courses in the near future: Value-at-Risk versus Expected Shortfall 2012 October 30-31, London. 30th: “Addressing the critical challenges and issues raised by the Basel proposal to replace VaR with Expected Shortfall” 31st: “Variability in Value-at-Risk and Expected Shortfall” led by Patrick Burns Details at CFP Events. Finance with R Workshop … Continue reading...

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Visually-weighted regression plots, with Zelig

September 25, 2012
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Visually-weighted regression plots, with Zelig

As a follow-up to yesterday’s post on producing visually-weighted regression plots, here is some code which illustrates the production of similar plots, but using Zelig’s convenient modeling and simulation functions. This code was produced...

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Formula for Kickstarter Success: Copious Planning (just like real life)

September 24, 2012
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Formula for Kickstarter Success: Copious Planning (just like real life)

It seems like the press can’t wait two days between awful depressing articles about how Kickstarter encourages fraud, broken promises, and tears.  Today I’d like to take you through a project thatshipped — let’s see what we can learn.  I interviewed Diana Rodgers of Wonder Threads.     Diana sought funding to expand her tech … Continue reading...

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Use GBIF and googleVis to Make Maps with Species Occurrence Data

September 24, 2012
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Use GBIF and googleVis to Make Maps with Species Occurrence Data

This is a short follow up on THIS posting.. I will briefly show how to use the dismo- and the googeVis package to plot species occurrences on an interactive Google map, like the one below (HERE is the R-script)MapID2ce4348e653

Computing kook density in R

September 24, 2012
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Computing kook density in R

Do you ever see strange lights in the sky? Do you wonder what really goes on in Area 51? Would you like to use your R hacking skills to get to the bottom of the whole UFO conspiracy? Of course, you would! UFO data from infochimps is the focus of a dat...

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The fear-index: is the VIX efficient to be warned about high volatility? (Finance & Systematic Processus)

September 24, 2012
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The fear-index: is the VIX efficient to be warned about high volatility?   (Finance & Systematic Processus)

Simple visually-weighted regression plots

September 24, 2012
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Simple visually-weighted regression plots

There has recently been a lot of discussion of so-called “visually-weighted regression” plots. Folk hero Hadley Wickham suggests that such plots would be easy to implement with ggplot2, and so I have attempted to prove him right. The approa...

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