Articles by Markus Gesmann

Kalman filter example visualised with R

January 6, 2015 | Markus Gesmann

At the last Cologne R user meeting Holger Zien gave a great introduction to dynamic linear models (dlm). One special case of a dlm is the Kalman filter, which I will discuss in this post in more detail. I kind of used it earlier when I measured the temperature in ... [Read more...]

Next Kölner R User Meeting: Friday, 12 December 2014

December 9, 2014 | Markus Gesmann

The next Cologne R user group meeting is scheduled for this Friday, 12 December 2014.We have an exciting agenda with two talks on Julia and Dynamic Linear Models:Introduction to Julia for R Users Hans Werner BorchersJulia is a high-performance dynamic programming language for scientific computing, with a syntax that is ... [Read more...]

Unknown pleasures

November 11, 2014 | Markus Gesmann

Have I missed unknown pleasures in Python by focusing on R? A comment on my blog post of last week suggested just that. Reason enough to explore Python a little. Learning another computer language is like learning another human language - it takes time...
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Phase plane analysis in R

November 4, 2014 | Markus Gesmann

The forthcoming R Journal has an interesting article about phaseR: An R Package for Phase Plane Analysis of Autonomous ODE Systems by Michael J. Grayling. The package has some nice functions to analysis one and two dimensional dynamical systems. As an example I use here the FitzHugh-Nagumo system introduced earlier:... [Read more...]

googleVis 0.5.6 released on CRAN

October 14, 2014 | Markus Gesmann

Version 0.5.6 of googleVis was released on CRAN over the weekend. This version fixes a bug in gvisMotionChart. Its arguments xvar, yvar, sizevar and colorvar were not always picked up correctly. Thanks to Juuso Parkkinen for reporting this issue.Exampl...
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Visualising the seasonality of Atlantic windstorms

October 7, 2014 | Markus Gesmann

Last week Arthur Charpentier sketched out a Markov spatial process to generate hurricane trajectories. Here, I would like to take another look at the data Arthur used, but focus on its time component. According to the Insurance Information Institute, a normal season, based on averages from 1980 to 2010, has 12 named storms, ...
[Read more...]

Running RStudio via Docker in the Cloud

September 30, 2014 | Markus Gesmann

Deploying applications via Docker container is the current talk of town. I have heard about Docker and played around with it a little, but when Dirk Eddelbuettel posted his R and Docker talk last Friday I got really excited and had to have a go myself.... [Read more...]

Managing R package dependencies

September 23, 2014 | Markus Gesmann

One of my take aways from last week's EARL conference was that R is more and more growing out of its academic roots into the enterprise. And with that come some challenges, e.g. how do I ensure consistent and systematic access to a set of R packages in an ... [Read more...]

Notes from the Kölner R meeting, 12 September 2014

September 16, 2014 | Markus Gesmann

Last Friday we had guests from Belgium and the Netherlands joining us in Cologne. Maarten-Jan Kallen from BeDataDriven came from The Hague to introduce us to Renjin, and the guys from DataCamp in Leuven, namely Jonathan, Martijn and Dieter, gave an overview of their new online interactive training platform.RenjinMaarten-Jan ... [Read more...]

Next Kölner R User Meeting: Friday, 12 September 2014

September 9, 2014 | Markus Gesmann

The next Cologne R user group meeting is scheduled for this Friday, 12 September 2014.We have a great agenda with international speakers: Maarten-Jan Kallen: Introduction to Renjin, the R interpreter for the JVM Jonathan Cornelissen, Martijn Theuwissen: DataCamp - An online interactive learning platform for R The event will be followed ... [Read more...]

Zoom, zoom, googleVis

September 2, 2014 | Markus Gesmann

The Google Charts API is quite powerful and via googleVis you can access it from R. Here is an example that demonstrates how you can zoom into your chart. In the example below I set the maximum zoom level to 5% of the chart. Drag and pan with a left mo...
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ChainLadder 0.1.8 released

August 26, 2014 | Markus Gesmann

Over the weekend we released version 0.1.8 of the ChainLadder package for claims reserving on CRAN. What is claim reserving?The insurance industry, unlike other industries, does not sell products as such but promises. An insurance policy is a promise by the insurer to the policyholder to pay for future claims ...
[Read more...]

googleVis 0.5.5 released

August 19, 2014 | Markus Gesmann

Earlier this week we released googleVis 0.5.5 on CRAN. The package provides an interface between R and Google Charts, allowing you to create interactive web charts from R. This is mainly a maintenance release, updating documentation and minor issues.Sc...
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GrapheR: A GUI for base graphics in R

August 12, 2014 | Markus Gesmann

How did I miss the GrapheR package? The author, Maxime Hervé, published an article about the package [1] in the same issue of the R Journal as we did on googleVis. Yet, it took me a package update notification on CRANbeeries to look into GrapheR in more detail - 3 years later! ... [Read more...]

Hit and run. Think Bayes!

July 29, 2014 | Markus Gesmann

At the R in Insurance conference Arthur Charpentier gave a great keynote talk on Bayesian modelling in R. Bayes' theorem on conditional probabilities is strikingly simple, yet incredibly thought provoking. Here is an example from Daniel Kahneman to test your intuition. But first I have to start with Bayes' theorem.... [Read more...]
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