Other – NLP, game theory, time series and negotiations

Dynamic charts with googleVis

22. May 201319. May 2021 Christoph

Dynamic charts are a nice way to visualize patterns over time. With the googleVis package this kind of graph has become easy to create. In this post, I will use the googleVis package to create two interactive moving bubble charts from the Global Terrorism Database (GTD).

Visualization of long- and short term stock movements

30. March 201319. May 2021 Christoph

Aim In this post I will explore, how correlations between long- and short-term stock movements can be visualized using R and ggplot2. I will look at the current German composite index DAX, but any other set of stocks–for which data are available–is feasible.

A quick look at the composition of terrorist events

10. March 2013 Christoph

In this blog entry, I will use data from the Global Terrorism Database to briefly explore some aspects of how the composition of terrorist events has changed over time.

Toda-Yamamoto implementation in ‘R’

7. November 201219. May 2021 Christoph

When it comes to causality tests, the typical Granger-causality test can be problematic. Testing for Granger-causality using F-statistics when one or both time series are non-stationary can lead to spurious causality (He & Maekawa, 1999). Professor Giles gives an excellent example of how the TY method can be implemented. More formal explanations can be found in […]

Quantifying attention to terrorism: Google searches vs. NYT

5. November 2012 Christoph

Empirical contributions that focus on terrorism and its reception by the media face the fundamental difficultly of quantifying media coverage of terrorism, which has led to a relatively thin body of empirical research on the subject: