October 2013

Data Preparation – Part I

October 31, 2013 | Flavio Barros

The R language provides tools for modeling and visualization, but is still an excellent tool for handling/preparing data. As C++ or python, there is some tricks that bring performance, make the code clean or both, but especially with R these choices can have a huge impact on performance and ... [Read more...]

Finding R in a Hadoop World

October 31, 2013 | Joseph Rickert

by Joseph Rickert The following is a brief report of all things R encountered in my not quite random, but nevertheless far from determined, walk through the O'Reilly Strata / Hadoop World Conference held this week in NYC. To start off, I had the pleasure of doing a 9:00 AM Monday morning ... [Read more...]

4th MilanoR meeting: please leave a comment

October 31, 2013 | Milano R net

4th MilanoR meeting took place on October, 24. More than thirty R users and a lot of enthusiasm! You can download presentations and view pictures of the meeting. If you attended the meeting, please leave a comment. Stay connected! Next … Continue reading → [Read more...]

Reshape and aggregate data with the R package reshape2

October 31, 2013 | thiagogm

Creating molten data Instead of thinking about data in terms of a matrix or a data frame where we have observations in the rows and variables in the columns, we need to think of the variables as divided in two groups: identifier and measured variables. Identifier variables (id) identify the ... [Read more...]

Presentations of the 4th MilanoR meeting

October 31, 2013 | Milano R net

Welcome presentation Nicola Sturaro, Meeting organizer (download PDF, 0.6 MB) R and Microsoft Office Nicola Sturaro, Consultant at Quantide (download PDF, 0.5 MB) Functions returning functions: closures Andrea Spanò, Partner at Quantide (download PDF, 0.5 MB) First steps in parallel … Continue reading → [Read more...]

Halloween and candies (a ballot problem)

October 30, 2013 | arthur charpentier

This year, for Halloween, a post on candies (I promise, next year I will write another post on zombies). But I don’t want to focus on the kids problems (last year, we tried to minimize their walking distance to collect as much candies as possible, with part 1 and part 2), ... [Read more...]

More significant? so what…

October 30, 2013 | arthur charpentier

Following my non-life insurance class, this morning, I had an interesting question from a student, that I will try to illustrate, and reformulate as accurately as possible. Consider a simple regression model, with one variable of interest, and one possible explanatory variable. Assume that we have two possible models, with ... [Read more...]

Multiple Removal Estimates at Once

October 30, 2013 | dogle

A Question Recently, a fishR user asked me the following question: I have recently used the FSA package to calculate Zippin depletion population estimates resulting from 3 pass removals on smaller trout streams. I have currently been doing this the … Continue reading → [Read more...]

What Hadley Wickham uses

October 30, 2013 | David Smith

You know Hadley Wickham as the inventor of the ggplot2 visualization phenomenon, the creator of time-saving R packages like plyr and lubridate, and the Chief Scientist at RStudio. But do you know what laptop Hadley uses, what software he uses (besides, R, of course), or his favourite kitchen appliance? Find ... [Read more...]

R and my divorce from Word

October 30, 2013 | Maxwell B. Joseph

Being in grad school, I do a lot of scholarly writing that requires associated or embedded R analyses, figures, and tables, plus bibliographies. Microsoft Word makes this unnecessarily difficult. Many tools are now available to break free from the tyranny of Word. The ones I like involve writing an article ... [Read more...]

Financial Data Accessible from R – part II

October 30, 2013 | The R Trader

I updated my initial post with two new sources of data and the associated R packages: Datastream and PWT. I also added the fImport package from Rmetrics. Following a reader suggestion, I made the initial table  more interactive, moved  the data description and package detail below the main table and ... [Read more...]

Percolation Threshold on a Square Lattice

October 29, 2013 | andrew

Manfred Schroeder touches on the topic of percolation a number of times in his encyclopaedic book on fractals (Schroeder, M. (1991). Fractals, Chaos, Power Laws: Minutes from an Infinite Paradise. W H Freeman & Company.). Percolation has numerous practical applications, the most interesting of which (from my perspective) is the flow of ... [Read more...]

swirl: Learning Statistics & R

October 29, 2013 | Dave Giles

Most of us would acknowledge that getting up to speed with R involves a pretty steep learning curve - but it's worth every drop of sweat we shed in the process! If you're learning basic statistics/econometrics, and learning R at the same time, then the challenge is two-fold. So, ... [Read more...]
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