When I ran I was expecting the same output as So this means that the dummy index in R “for” loops cannot be tweaked that easily. I seem to remember doing this kind of (dirty) tricks with earlier versions… Now, Alessandra and Robin think this is a good thing that ... [Read more...]

I’ve been a user (and fan) of gWidgets for a couple of years now for GUI building in R. (See my introduction to it here.) However, it’s always good to check out the competition so I’ve been playing around with Deducer to see how they compare. R ... [Read more...]

Knowing the weakness of your tool is a shortcut toward getting really good at it. [Read more...]

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There's a new R user group in Berkely, CA: The Berkeley R Language Beginner Study Group. Join this small group for a step-by-step approach to learn the language R. Each session will be filled with examples and participants are welcome to suggest and present topics. If you have just started ... [Read more...]

Polygon simplification is something others have written about, using R packages such as shapefiles. This explores how package ‘rgeos’ uses the Ramer–Douglas–Peucker algorithm, a method commonly used in GIS systems for simplifying shapefiles. It works by imposing a deviation tolerance … Continue reading → [Read more...]

Guest post:  Statistics.com is offering a list of courses about R from some of the leading experts in their fields.  They offer a $200 discount for anyone who orders any 3 [Read more...]

In my my last post I described how to produce a multivariate choropleth map with R. Now I will show …Continuar leyendo » [Read more...]

We know the words but what do they mean? Some definitions Here are some definitions of “passive investment management”. Investopedia says: A style of management associated with mutual and exchange-traded funds (ETF) where a fund’s portfolio mirrors a market index. Wikipedia says: Passive management (also called passive investing) is ... [Read more...]

It is pretty easy to monitor the progress of a long loop in R using the original txtProgressBar function in the utils package. It works like this:

mypb <span><-</span> txtProgressBar<span>()</span>
m <span><-</span> sapply<span>(</span><span>1</span><span>:</span><span>1000</span><span>,</span> <span>function</span><span>(</span>x<span>)</span> <span>{</span>
  setTxtProgressBar<span>(</span>mypb<span>,</span> x<span>/</span><span>1000</span><span>)</span>
  mean<span>(</span>rnorm<span>(</span>x<span>))</span>
<span>})</span>
close<span>(</span>mypb<span>)</span>

You could even get a GUI-type output using tkProgressBar from the tcltk package, or winProgressBar. Or you could build your own. The ... [Read more...]

This video shows how to obtain and install R on the Windows (PC) platform. It also shows a few basic functions in R, such as how to install packages in R and load them for use. [Read more...]

SAS is much touted for its ability to read in huge datasets, and rightly so. However, that ability comes at a cost: for smaller datasets, since files remain on the disk rather than in memory (as is the case with Stata and R), it is potentially less fa... [Read more...]

If you are reading this vis-à-vis R-Bloggers, then you know how good R, LaTeX, and Sweave are for generating reports and/or conducting reproducible research. It has been particularly valuable for me in Institutional Research where there are many reports that I need to prepare on a regular basis (... [Read more...]

Another problem generated by X’validated (on which I spent much too much time!): given an unbiased coin that produced M heads in the first M tosses, what is the expected number of additional tosses needed to get N (N__M) consecutive heads? Consider the preliminary question of getting a ... [Read more...]

[This article was first published on NIR-Quimiometría, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

Open source is amazing! I cannot even start to imagine the amount of work invested in R, in firefox browser (Mozilla), or Rstudio IDE, all of which are used extensively around the globe, free. Not free as in: free sample … Continue reading → [Read more...]

This is the third part in a three part series on teaching R to MFE students at CUNY Baruch. The …Continue reading » [Read more...]

This is the first post of a short series to show some code I have learnt to produce maps with …Continuar leyendo » [Read more...]

The new RcppArmadillo release 0.2.35 now supports the Rcpp::Rcout output stream device. Based on a contributed Rcpp patch by Jelper Ypma, the Rcpp::Rcout output stream gets redirected to R's buffered output. In other words, R's own output and that e... [Read more...]

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