February 2013

Shading and Points with xtsExtra plot.xts

February 28, 2013 | 0 Comments

For some reason, I feel like have much better control with plot.xts function from the xtsExtra package described here over some of the other more refined R graphical packages. Maybe, it is just my simple mind, but recently I wanted to shade holding per...
[Read more...]

ETS models now in EViews 8

February 28, 2013 | 0 Comments

The ETS modelling framework developed in my 2002 IJF paper (with Koehler, Snyder and Grose), and in my 2008 Springer book (with Koehler, Ord and Snyder), is now available in EViews 8. I had no idea they were even working on it, so it was quite a surprise to be told that EViews ... [Read more...]

Statistical computation in JavaScript — am I nuts?

February 28, 2013 | 0 Comments

Over the past couple weeks, I’ve been considering alternatives to R. I’d heard Python was much faster, so I translated a piece of R code with several nested loops into Python (it ran an order of magnitude faster). To find out more about Mathematica 9, I had an extended ... [Read more...]

Shapefiles in R

February 28, 2013 | 0 Comments

Let's learn how to use Shapefiles in R. This will allow us to map data for complicated areas or jurisdictions like zipcodes or school districts. For the United States, many shapefiles are available from the Census Bureau. Our example will map U.S. nati... [Read more...]

EPL Table Motion Chart

February 28, 2013 | 0 Comments

The Shiny package provides great user interactivity and another boost to its attractiveness has come with its integration with googleVis. Markus Gesman provides some background in a blog article with coded examples which he along with fellow googleVis creator, Diego de Castillo and lead Shiny developer Winson Chang have furnished ... [Read more...]

Using R in LaTeX with knitr and RStudio

February 28, 2013 | 0 Comments

Hi, I presented today at INSEE R user group (FLR) how to use knitr (Sweave evolution) for writing documents which are self contained with respect to the source code: your data changed? No big deal, just compile your .Rnw file again and you are done with an updated version of ... [Read more...]

Summary of My First Trip to Strata #strataconf

February 28, 2013 | 0 Comments

In this post I am goIing to summarize some of the things that I learned at Strata Santa Clara 2013. For now, I will only discuss the conference sessions as I have a much longer post about the tutorial sessions that I am still working on and will post at a ... [Read more...]

Slides from "Big Data Real Time Predictive Analytics"

February 28, 2013 | 0 Comments

At Tuesday's Data Driven Business Day at the Strata conference I gave my talk, Real-time Big Data Predictive Analytics: From Deployment to Production. My goal in the talk was to explain the buzz-phrases "real time", "big data" and "predictive examples" in the context of a specific example: why are some ... [Read more...]

Pollination effectiveness landscape

February 28, 2013 | 0 Comments

I want to show you a pollination landscape, but this is not a pollinator landscape with flowers and nesting sites, but a plot showing two components of pollination. Quantity and quality. A recent paper by Pedro Jordano (see here for other … Continue reading → [Read more...]

Classifying Emails as Spam or Ham using RTextTools

February 28, 2013 | 0 Comments

Recently, I had read an article on R-bloggers, titled Classifying Breast Cancer as Benign or Malignent using RTextTools by Timothy P. Jurka, who is the author of both that article and the RTextTools package. Having reproduced the results using the... [Read more...]

System Testing

February 28, 2013 | 0 Comments

R at Work...crunching numbersIf you wanna find out how your trading idea would have coped in the previous years you would perform a backtest. For years I have used commercial software but could not find a package, which I would really recommend. I have... [Read more...]

The MaxDiff Killer: Rank-Ordered Logit Models

February 27, 2013 | 0 Comments

Compared to MaxDiff (Sawtooth Software), ranked-order logit modeling:simplifies data collection without needing additional software to generate experimental designsreduces respondent burden making the task easier and seemingly ... [Read more...]

inline 0.3.11

February 27, 2013 | 0 Comments

A maintenance release of inline is now on CRAN, and is being uploaded to Debian. The release fixes two minor bugs kindly reported by users. As the two previous releases appear to not have been announced here, their NEWS entries are included as well. ... [Read more...]

The Paul Tol 21-color salute

February 27, 2013 | 0 Comments

You may or may not know that PerformanceAnalytics contains a number of specific color schemes designed for charting data in R (they aren’t documented well, but they show up in some of the chart examples). I’ve been collecting color palates for years in search of good combinations of ... [Read more...]

Graphical Tools (rgl) on a Headless Shiny Server

February 27, 2013 | 0 Comments

If you’ve encountered errors such as Warning in rgl.init(initValue) : RGL: unable to open X11 display Warning in fun(libname, pkgname) : error in rgl_init or Error: rgl_dev_getcurrent when trying to use a graphically based package like RGL with Shiny Server, then you’re in the ... [Read more...]

Non-Linear Curve Fitting is Nature Publication Worthy?

February 27, 2013 | 0 Comments

Someone needs to explain to me why this is a Nature publication ...Granted it is Nature Protocols which started its publication run when I was in grad school and is likely less high-impact as full blown Nature.  Seriously tough - using the So... [Read more...]

Workshops on Modelling Choices using R in Toronto

February 27, 2013 | 0 Comments

Making choices is inherently human. We choose between brands of cereal or amongst candidates in an election. At times, choices may be influenced by the characteristics of the decision maker, such as age, income and sex. Choices may also be influenced by the attributes of competing alternatives, such as the ... [Read more...]

UPDATE Multiple postgreSQL Table Records in Parellel

February 27, 2013 | 0 Comments

Unfortunately the RpostgreSQL package (I’m pretty sure other SQL DBs as well) doesn’t have a provision to UPDATE multiple records (say a whole data.frame) at once or allow placeholders making the UPDATE a one row at a time ordeal, so I built a work around hack to ... [Read more...]

Resampling data in Hadoop with RHadoop

February 27, 2013 | 0 Comments

On Revolution Analytics partner Cloudera's blog, Uri Laserson has posted an excellent guide to resampling from a large data set in Hadoop. Resampling is an important step in fitting ensemble models (including random forests and other bagging techniques), and Uri provides a step-by-step guide to implementing resampling methods using RHadoop. ... [Read more...]
1 2 3 15

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)