Blog Archives

Progress bars in R (part II) – a wrapper for apply functions

January 10, 2010
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Progress bars in R (part II) – a wrapper for apply functions

In a previous post I gave some examples of how to make a progress bar in R. In the examples the bars were created within loops. Very often though I have situations where I would like have a progress bar when using apply(). The plyr package provides several apply-like functions also including progress bars, so

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Infomaps using R – Visualizing German unemployment rates by district on a map

November 16, 2009
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Infomaps using R – Visualizing German unemployment rates by district on a map

Lately, David Smith from REvolution Computing set out to challenge the R community with the reprocuction of a beautiful choropleth map (= multiple regions map/thematic map) on US unemployment rates he had seen on the Flowing Data blog. Here you can find the impressing results. Being a fan of beautiful visualizations I tried to produce

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R: Function to create tables in LaTex or Lyx to display regression model results

June 19, 2009
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R: Function to create tables in LaTex or Lyx to display regression model results

Most people using LaTex feel that creating tables is no fun. Some days ago I stumbled across a neat function written by Paul Johnson that produces LaTex code as well as LaTex code that can be used within Lyx. The output can be used for regression models and looks like output from the Stata outreg

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Getting started with R (for german speakers)

June 5, 2009
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Getting started with R (for german speakers)

Just a little note for german speaking R beginners: There is an introductory course in R (german) available online on the website of the department of methodology and evaluation research at the University of Jena. Dr. Ivailo Partchev holds a seven sess...

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R: Building functions – using default settings that can be modified via the dot-dot-dot / three point argument

April 7, 2009
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R: Building functions – using default settings that can be modified via the dot-dot-dot / three point argument

Before you read this post, please have a look at Enrique’s comment below. He pointed out that the built-in R function modifyList() already does what I wanted to describe in this post. Well, I live to learn :) I was wondering how I could write a function that uses default settings but accepts a list

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How accurate or reliable are R calculations?

March 28, 2009
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How accurate or reliable are R calculations?

On the REvolutions Blog there is a nice posting treating the often raised concern on “How good or reliable R is”. At my university R is hardly used. Sometimes I was asked by lecturers wether the calculations done by R and its packages are accurate. The linked posting treats this matter and tries to clarify

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R: Zip fastener for two data frames / combining rows or columns of two dataframes in an alternating manner

March 27, 2009
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R: Zip fastener for two data frames / combining rows or columns of two dataframes in an alternating manner

Sometimes I find it useful to merge two data frames like the following ones   X1 X2 X3 X4 Y1 Y2 Y3 Y4 1  o  o  o  o X X X X 2  o  o  o  o X X X X 3  o  o  o  o X X X X by using zip feeding either

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R: Monitoring the function progress with a progress bar

March 16, 2009
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R: Monitoring the function progress with a progress bar

Every once in while I have to write a function that contains a loop doing thousands or millions of calculations. To make sure that the function does not get stuck in an endless loop or just to fulfill the human need of control it is useful to monitor the progress. So  first I tried the

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R: Good practice – adding footnotes to graphics

February 17, 2009
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R: Good practice – adding footnotes to graphics

In some statistical programs there is the option available to attach a footnote to the graphical output that is created. This footnote may contain the name of the script or the file that produced the graphic, the author’s name and the date of creation. In SAS for example there is a footnote command to achieve

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R: Calculating all possible linear regression models for a given set of predictors

February 6, 2009
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R: Calculating all possible linear regression models for a given set of predictors

Although the graphic at the left might not seem a 100% appropriate, it gives a hint to what I am about to do. I want to calculate all possible linear regression models with one dependent and several independent variables. I do not want to address bias and fitting issues or the question if this

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