Articles by Markus Gesmann

R in Insurance Conference, London, 15 July 2013

December 19, 2012 | Markus Gesmann

The first conference on R in Insurance will be held on Monday 15 July 2013 at Cass Business School in London, UK. The intended audience of the conference includes both academics and practitioners who are active or interested in the applications of R in insurance.This one-day conference will focus on applications ...

[Read more...]

Now I see it! K-means cluster analysis in R

December 17, 2012 | Markus Gesmann

Of course, a picture on a computer monitor is a coloured plot of x and y coordinates or pixels. Still, I was smitten by David Sparks' posts on is.r(), where he shows how easy it is to read images into R to analyse them. In two posts [1], [2] he replicates ... [Read more...]

Comparing regions: maps, cartograms and tree maps

December 11, 2012 | Markus Gesmann

Last week I attended a seminar where a talk was given about the economic opportunities in the SAAAME (South-America, Asia, Africa and Middle East) regions. Of course a map was shown with those regions highlighted. The map was not that disimilar to the one below.

library(RColorBrewer)<br>library(rworldmap)<br>data(countryExData)<br>par(mai=c(0,0,0.2,0),xaxs="i",yaxs="i")<br>mapByRegion( countryExData, <br>             nameDataColumn="GDP_capita.MRYA",<br>             joinCode="ISO3", nameJoinColumn="ISO3V10",<br>             regionType="Stern", mapTitle=" ", addLegend=FALSE,<br>             FUN="mean", colourPalette=brewer.pal(6, "Blues"))

It is a map ... [Read more...]

Changing colours and legends in lattice plots

December 4, 2012 | Markus Gesmann

Lattice plots are a great way of displaying multivariate data in R. Deepayan Sarkar, the author of lattice, has written a fantastic book about Multivariate Data Visualization with R [1]. However, I often have to refer back to the help pages to remind myself how to set and change the legend ... [Read more...]

Data.table rocks! Data manipulation the fast way in R

November 27, 2012 | Markus Gesmann

I really should make it a habit of using data.table. The speed and simplicity of this R package are astonishing. Here is a simple example: I have a data frame showing incremental claims development by line of business and origin year. Now I would like add a column with ... [Read more...]

Claims reserving in R: ChainLadder 0.1.5-4 released

November 20, 2012 | Markus Gesmann

Last week we released version 0.1.5-4 of the ChainLadder package on CRAN. The R package provides methods which are typically used in insurance claims reserving. If you are new to R or insurance check out my recent talk on Using R in Insurance.The chain-ladder method which is a popular ... [Read more...]

Simulating neurons or how to solve delay differential equations in R

November 13, 2012 | Markus Gesmann

I discussed earlier how the action potential of a neuron can be modelled via the Hodgkin-Huxely equations. Here I will present a simple model that describes how action potentials can be generated and propagated across neurons. The tricky bit here is that I use delay differential equations (DDE) to take ... [Read more...]

googleVis 0.3.3 is released and on its way to CRAN

November 2, 2012 | Markus Gesmann

I am very grateful to all who provided feedback over the last two weeks and tested the previous versions 0.3.1 and 0.3.2, which were not released on CRAN. So, what changed since version 0.3.2?Not much, but plot.gvis didn't open a browser window when op...

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googleVis 0.3.2 is released: Better integration with knitr

October 29, 2012 | Markus Gesmann

After last week's kerfuffle I hope the roll out of googleVis version 0.3.2 will be smooth. To test the water I release this version into the wild here and if it doesn't get shot down in the next days, then I shall try to upload it to CRAN. I am mindful...

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googleVis 0.3.0/0.3.1 is released: It’s faster!

October 23, 2012 | Markus Gesmann

Version 0.3.0 of the googleVis package for R has been released on CRAN on 20 October 2012. With this version we have been able to speed up the code considerably. The transformation of R data frames into JSON works significantly faster. The execution of the gvisMotionChart function in the World Bank demo is ...

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Review: Kölner R Meeting 5 October 2012

October 10, 2012 | Markus Gesmann

The third Cologne R user meeting took place last Friday, 5 October 2012, at the Institute of Sociology. The evening was sponsored by Revolution Analytics, who provided funding which went towards the Kölner R user group Meetup page. We had a good tur... [Read more...]

Connecting the real world to R with an Arduino

October 2, 2012 | Markus Gesmann

If connecting data to the real world is the next sexy job, then how do I do this? And how do I connect the real world to R? It can be done as Matt Shottwell showed with his home made ECG and a patched version of R at useR! 2011. However, ... [Read more...]

Next Kölner R User Meeting: 5 October 2012

September 25, 2012 | Markus Gesmann

The next Cologne R user group meeting is scheduled for 5 October 2012. All details and the agenda are available on the KölnRUG Meetup site. Please sign up if you would like to come along. Notes from the last Cologne R user group meeting are available ... [Read more...]

Using R in Insurance at GIRO 2012

September 17, 2012 | Markus Gesmann

Every year the UK’s general insurance actuarial community organises a big conference, which they call GIRO, short for General Insurance Research Organising committee. This year's conference is in Brussels from 18 - 21 September 2012. Despite the fac... [Read more...]

Connecting data to the real world – The next sexy job?

September 11, 2012 | Markus Gesmann

At last week's Royal Statistical Society (RSS) conference Hal Varian, Chief Economist at Google, gave a panel talk about 'Statistics at Google'. Could he get a better audience than the RSS? Hal talked about his career in academia and at Google. He remi... [Read more...]

Interactive web graphs with R – Overview and googleVis tutorial

September 5, 2012 | Markus Gesmann

Today I feel very lucky, as I have been invited to the Royal Statistical Society conference to give a tutorial on interactive web graphs with R and googleVis. I prepared my slides with RStudio, knitr, pandoc and slidy, similar to my Cambridge R talk. ... [Read more...]

Are career motivations changing?

August 28, 2012 | Markus Gesmann

The German news magazine Der Spiegel published a series of articles [1, 2] around career developments. The stories suggest that career aspirations of young professionals today are somewhat different to those of previous generations in Germany. Apparen...

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Sigma motion visual illusion in R

August 21, 2012 | Markus Gesmann

Michael Bach, who is a professor and vision scientist at the University of Freiburg, maintains a fascinating site about visual illusions. One visual illusion really surprised me: the sigma motion. The sigma motion displays a flickering figure of bla... [Read more...]

googleVis 0.2.17 is released: Displaying earth quake data

August 13, 2012 | Markus Gesmann

The next version of the googleVis package has been released on the project site and CRAN. This version provides updates to the package vignette and a new example for the gvisMerge function. The new sections of the vignette have been featured on this ... [Read more...]

London Olympics 100m men’s sprint results

August 5, 2012 | Markus Gesmann

The 100m mean's sprint finals of the 2012 London Olympics are over and Usain Bolt won the gold medal again with a winning time of 9.63s. Time to compare the result with my forecast of 9.68s, posted on 22 July. My simple log-linear model predicted ... [Read more...]

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Articles by Markus Gesmann

R in Insurance Conference, London, 15 July 2013

Now I see it! K-means cluster analysis in R

Comparing regions: maps, cartograms and tree maps

Changing colours and legends in lattice plots

Data.table rocks! Data manipulation the fast way in R

Claims reserving in R: ChainLadder 0.1.5-4 released

Simulating neurons or how to solve delay differential equations in R

googleVis 0.3.3 is released and on its way to CRAN

googleVis 0.3.2 is released: Better integration with knitr

googleVis 0.3.0/0.3.1 is released: It’s faster!

Review: Kölner R Meeting 5 October 2012

Connecting the real world to R with an Arduino

Next Kölner R User Meeting: 5 October 2012

Using R in Insurance at GIRO 2012

Connecting data to the real world – The next sexy job?

Interactive web graphs with R – Overview and googleVis tutorial

Are career motivations changing?

Sigma motion visual illusion in R

googleVis 0.2.17 is released: Displaying earth quake data

London Olympics 100m men’s sprint results

Articles by Markus Gesmann

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