The second round of group games ended last night (sadly with Sweden’s elimination). Here is what the last number of days has done to the plots. [Read more...]

Now that every team has played a match it will be interesting to see how this has affected the (inverse) odds of victory. Since the plot in my last post was a bit ‘busy’, I have decided to use the facet_wrap function in gglplot2 to stratify by group. Also, ... [Read more...]

After scanning this paper by Zeileis, Leitner & Hornik, I thought it would be interesting to see how the victory odds for each team changes as Euro 2012 progresses. To do this, I am going to collect the daily inverse odds of a tournament victory offered by a popular betting site for ... [Read more...]

ggplot2 improves the graphics drawn with R. A (very) short adaptation time is needed to find how to make graphs equivalent to the ones of graphics. For example, to draw the curve of a function, there is no function similar to curve(). You have to use qplot() by setting the ... [Read more...]

In this series of three posts, we’ll look at colours in R graphics produced with ggplot2: what are the available choices of colour schemes, and how to choose a colour palette most suitable for a particular graphic? In kindergarten, choosing a co... [Read more...]

A question was raised today on the mailing list: Is there an easy way to add a watermark to a ggplot? There are several options, depending on the type of watermark and the required level of control over the output, add a text label using annotate (th... [Read more...]

Next week I’ll present a glimpse of R and ggplot2 graphics at VUW. This is a MESA seminar on ‘Data analysis and plotting with free and open source tools’ where we’ll present spreadsheet alternatives based on gnuplot, Python, an... [Read more...]

Accounting for temporal dependence in econometric analysis is important, as the presence of temporal dependence violates the assumption that observations are independent units. Historically, much less attention has been paid to correcting for spatial dependence, which, if present, also violates this independence assumption. The comparability of temporal and spatial dependence ... [Read more...]

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I suspect I am not unique in not being able to remember how to control the point shapes in R. Part of this is a documentation problem: no package ever seems to write the shapes down. All packages just use the “usual set” that derives from S-Plus and was carried ... [Read more...]

The common approach to estimating a binary dependent variable regression model is to use either the logit or probit model. Both are forms of generalized linear models (GLMs), which can be seen as modified linear regressions that allow the dependent variable to originate from non-normal distributions. The coefficients in a ... [Read more...]

With print() If you are an advanced R user, you probably know the lattice and the ggplot2 packages. They allow you to plot elegant graphics with less code (Hocking, 2009 and Sueur, 2010). If you know these two packages, you should hardly use plot() for your graphs. If you read my article ... [Read more...]

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In this post I use OpenStreetsMaps and ggplot2 to plot geographically were psychologists live, using data from a facebook document. [Read more...]

I searched PubMed for several major DSM-IV disorders and downloaded the hits. Using ggplot2 I plotted the number of publications each year for each disorder. [Read more...]

Ever wondered how different psychotherapy orientations match up in a PubMed battle? Continue reading to find out and to see how to test this using R and Ggplot2. [Read more...]

I found out that last.fm had made data files available for their Best of 2011 artist list, and I thought it'd be a great opportunity to learn some more about data management in R and Ggplot2. [Read more...]

Using R I'm doing a lot of simulations of the classic monty hall-problem and plotting multiple simulations using ggplot2. [Read more...]

In the previous post I shared an example how to get high frequency data from IB broker (well, it is retail version of HFD – it has only best bid/ask and the trades). Now, once you saved some data – what should you do next? Next logical step would be data ... [Read more...]

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