doSMP removed from CRAN

February 17, 2012
By
doSMP removed from CRAN

If you do parallel processing in R on Windows, then you probably have heard of the doSMP package. However, it was recently removed from the CRAN repository with the terse message: Package ‘doSMP’ was removed from the CRAN repository. Revolution … Continue reading →

Read more »

R in Financial Services Viewpoint newsletter

February 17, 2012
By

The Winter 2012 edition of Sybase's Financial Services Viewpoint newsletter includes two articles related to R. The "Industry Insight" article "R is Hot" (written by yours truly) is a one-page summary of the R phenomenon: what it is, how it's used, and how it's revolutionizing data analysis. The "Industry Insight" article by SAP's Melinda Wilson, "R swings the pendulum...

Read more »

RcppArmadillo 0.2.35

February 17, 2012
By

Now that Rcpp 0.9.10 is released and on CRAN, other packages can take advantage of a small change needed to make use of the quasi-output stream Rcpp::Rcout. So the new release 0.2.35 of RcppArmadillo does just that---and input/output from Armadillo...

Read more »

Visualizing the Correlations of a Matrix

February 17, 2012
By
Visualizing the Correlations of a Matrix

Correlation matrices are a common way to look at the dependence of a set of variables. When the variables have spatial relationships, the correlation matrix loses some information.Lets say you have repeated observations, each one being a matrix. For ex...

Read more »

Plotting the “Mean Spectrum”

February 17, 2012
By
Plotting the “Mean Spectrum”

(This article was first published on NIR-Quimiometría, and kindly contributed to R-bloggers) Mean spectrum calculation is important: To center a matrix of spectra, we subtract the mean spectrum, from every spectrum in the matrix. There are also many options to use the mean spectrum, like average subsamples. Let´s calculate and plot the mean spectra for the Yarn NIR Data:...

Read more »

Visualising Twitter User Timeline Activity in R

February 17, 2012
By
Visualising Twitter User Timeline Activity in R

I’ve largely avoided “time” in R to date, but following a chat with @mhawksey at #dev8d yesterday, I went down a rathole last night exploring a few ways of visualising a Twitter user timeline and as a result also had a quick initial play with some time handling features of R, such as timeseries objects,

Read more »

Rcpp 0.9.10

February 17, 2012
By

A new release 0.9.10 of Rcpp is now on CRAN and in Debian. This is mostly internal release with a little bit of code reorgination (some of which will be used by a forthcoming RcppArmadillo release), some changes to make R CMD check happy, and one or ...

Read more »

Course: Statistical Practice in Epidemiology with R

February 17, 2012
By
Course: Statistical Practice in Epidemiology with R

Statistical Practice in Epidemiology with R is a one week course aimed at promoting the use of R among epidemiologists.  This annual course has been running almost every year since 2004. Last year it took place in Lyon, France, but … Continue reading →

Read more »

10,000 R Questions on Stackoverflow

February 17, 2012
By
10,000 R Questions on Stackoverflow

I was browsing stackoverflow when suddenly I noticed: 10 thousand questions tagged! I started using Stackoverflow almost exactly a year ago and remember that the counter was about 3 thousand at the time. It is a beautiful example of how fast the R community is … Continue reading →

Read more »

draw chinese character Jiong using ggplot2

February 17, 2012
By
draw chinese character Jiong using ggplot2

The Chinese character Jiong (囧) is now widely used for expressing ideas or feelings such as annoyance, shock, embarrassment, awkwardness, scorn. The function plot of y=1/(x^2-1) looks very similar of this symbol. I use ggplot2 to draw the symbol of Jiong. Read More: 359 Words Totally

Read more »

Useful functions for data frames in R

February 17, 2012
By

This post will consider some useful functions for dealing with data frames during data processing and validation. Consider an artifical data set create using the expand.grid function where there are duplicate rows in the data frame. > des = expand.grid(A = c(2,2,3,4), B = c(1,3,5,5,7)) > des A B 1 2 1 2 2 1

Read more »

Take the INNGE survey on math and ecology

February 17, 2012
By

Many ecologists are R users, but we vary in our understanding of the math and statistical theory behind models we use. There is no clear consensus on what should be the basic mathematical training of ecologists. To learn what the community thinks, we ...

Read more »

R hits 10000 questions on stackoverflow

February 17, 2012
By
R hits 10000 questions on stackoverflow

A milestone, though not that exciting as questions go. Still, if you haven’t yet joined the cult of Stack Exchange, take a look here. Tagged: r, stackoverflow

Read more »

R for Quants, Part II (A)

February 16, 2012
By
R for Quants, Part II (A)

This is the second part in a three part series on teaching R to MFE students at CUNY Baruch. The …Continue reading »

Read more »

Machine Learning for Hackers

February 16, 2012
By
Machine Learning for Hackers

"Machine Learning for Hackers" is a new book from O'Reilly Media by Drew Conway and John Myles White. A "hacker", here, is "someone who likes to solve problems and experiment with new technologies", and "Machine Learning" is usually thought of as a black-box, algorithmic approach to producing predictions or classifications from data. This book, however, takes a pleasingly statistical...

Read more »

How to Install R for Mac and Use a Few Basic Functions

February 16, 2012
By

This video shows how to obtain and install R on the Mac OS X platform. It also shows a few basic functions in R, such as how to install packages in R and load them for use. A PC version will follow shortly.

Read more »

How to Install R for Mac and Use a Few Basic Functions

February 16, 2012
By

This video shows how to obtain and install R on the Mac OS X platform. It also shows a few basic functions in R, such as how to install packages in R and load them for use. A PC version will follow shortly

Reflect your Personnel Selection: R & Taylor-Russell Tables

February 16, 2012
By
Reflect your Personnel Selection: R & Taylor-Russell Tables

Taylor-Russell tables (Taylor & Russell, 1939) are designed to estimate the percentage of future employees who will be successful on the job if a particular selection method (eg. test, assessment center, interview) is used. I have already described the kibit … Weiterlesen →

Read more »

Simulating p curves and detecting dodgy stats

February 16, 2012
By
Simulating p curves and detecting dodgy stats

Psych your mind has an interesting blog post on using p curves to detect dodgy stats in a a volume of published work (e.g., for a researcher or journal). The idea apparently comes from Uri Simonsohn (one of the authors of a recent paper on dodgy s...

Read more »

Color Theme for Eclipse IDE + StatET Editor: rappster

February 16, 2012
By
Color Theme for Eclipse IDE + StatET Editor: rappster

I’ve played around a bit with the Eclipse Color Themes plugin by Felix Dahlke and Roger Dudler as they added support for the R editor that ships with plugin StatET late last year. The outcome is a little color theme called rappster. The nice thing with those color themes is that you can make your syntax … Continue reading...

Read more »

NIR "Cross Validaton Statistics" with "R"

February 16, 2012
By
NIR "Cross Validaton Statistics" with "R"

We have to check different options before to decide for one model:Configure different cross validations.Configure different math  treatments.Configure number of terms.With the Yarn NIR data, I have develop 4 models, for a simple exercise.Of course...

Read more »

XLConnect 0.1-8

February 16, 2012
By
XLConnect 0.1-8

Mirai Solutions GmbH (http://www.mirai-solutions.com) is pleased to announce the availability of XLConnect 0.1-8 on CRAN. The most prominent new features/extensions are an improved package vignette which provides more information and examples to get people started with the package. A new … Continue reading →

Read more »

Code for Machine Learning for Hackers

February 16, 2012
By

With the release of the eBook version of Machine Learning for Hackers this week, many people have been asking for the code. With good reason—as it turns out—because O’Reilly still (at the time of this writing) has not updated the book page to include a link to the code. For those interested, my co-author John Myles

Read more »

VilniusR – R users group in Lithuania

February 16, 2012
By

Today is Lithuania’s independence day and I have created R user group in Lithuania – VilniusR. If you are near by please follow the link, sign up and I hope that we will have a meeting soon.

Read more »

MAT8886 reducing dimension using factors

February 16, 2012
By
MAT8886 reducing dimension using factors

First, let us recall a standard result from linear algebra: "real symmetric matrices are diagonalizable by orthogonal matrices". Thus, any variance-covariance matrix can be written since a variance-covariance matrix is also definite positive. In ...

Read more »

The BurStFin R package

February 16, 2012
By
The BurStFin R package

Version 1.01 of BurStFin is now on CRAN. It is written entirely in R, and meant to be compatible with S+. Functionality The package is aimed at quantitative finance, but the variance estimation functions could be of use in other applications as well. Also of general interest is threeDarr which creates a three-dimensional array out … Continue reading...

Read more »

Reshaping the IT world

February 16, 2012
By
Reshaping the IT world

During my university time I worked on the IT help desk for a while. One day I received a call from a professor, who said that his printer had stopped working. So I asked him, if there was a message on the display and if he could read it to me. "Oh yes"...

Read more »

MAT8886 the Dirichlet distribution

February 15, 2012
By
MAT8886 the Dirichlet distribution

In the course, still introducing some concept of dependent distributions, we will talk about the Dirichlet distribution (which is a distribution over the simplex of ). Let denote the Gamma distribution with density (on ) Let denote independent...

Read more »

Revolution Newsletter: February 2012

February 15, 2012
By

The most recent edition of the Revolution Newsletter is out. The news section is below, and you can read the full February edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Revolution Analytics Welcomes New CEO, Dave Rich. Dave joins the Revolution team from Accenture...

Read more »