Machine Learning for Hackers

February 16, 2012
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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...

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

February 16, 2012
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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.

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

February 16, 2012
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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
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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 →

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Simulating p curves and detecting dodgy stats

February 16, 2012
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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...

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Color Theme for Eclipse IDE + StatET Editor: rappster

February 16, 2012
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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...

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NIR "Cross Validaton Statistics" with "R"

February 16, 2012
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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...

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XLConnect 0.1-8

February 16, 2012
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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 →

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Code for Machine Learning for Hackers

February 16, 2012
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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

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VilniusR – R users group in Lithuania

February 16, 2012
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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.

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MAT8886 reducing dimension using factors

February 16, 2012
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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 ...

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The BurStFin R package

February 16, 2012
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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...

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Reshaping the IT world

February 16, 2012
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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"...

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MAT8886 the Dirichlet distribution

February 15, 2012
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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...

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Revolution Newsletter: February 2012

February 15, 2012
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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...

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R-Bloggers Steadily Growing

February 15, 2012
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R-Bloggers Steadily Growing

Description: Number of blogs aggregated into the R-Bloggers news site. Data: http://www.r-bloggers.com/ Analysis: R-Bloggers is a website devoted to news and tutorials related to the R programming language. The content is generated by a growing ...

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The R-Podcast is Now on iTunes

February 15, 2012
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I am happy to report that the R-Podcast is now on iTunes. If you would like to subscribe to the podcast using iTunes, you can click on the iTunes logo or the iTunes link under Podcast Subscription Options on the right hand side of the page. Detailed information on how to subscribe to the podcast

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Generating Twitter Wordclouds in R (Prompted by an Open Learning Blogpost)

February 15, 2012
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Generating Twitter Wordclouds in R (Prompted by an Open Learning Blogpost)

A couple of weeks ago I saw a great example of an open learning blogpost from @katy_bird: Generating a word cloud (or not) from a Twitter hashtag. It described the trials and tribulations associated with trying to satisfy a request for the generation of a wordcloud based on tweets associated with a specific Twitter hashtag.

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"NIR Std. Dev. Spectra" with "R"

February 15, 2012
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"NIR  Std. Dev. Spectra" with "R"

(This article was first published on NIR-Quimiometría, and kindly contributed to R-bloggers) It is always good to look at the spectra from different points of view, before to develop a regression, this will help us to understand better our samples, to detect outliers, to check where the variability is, if that variability correlates with the constituent of interest (directly...

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MAT8886 elliptically contoured distributions

February 15, 2012
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MAT8886 elliptically contoured distributions

(This article was first published on Freakonometrics - Tag - R-english, and kindly contributed to R-bloggers) Last week, we've introduced the concept of exchangeable variables, i.e. satisfying for any matrix  , i.e. is a permutation matrix: belongs to the orthogonal group, , and with elements in . It is possible to extend that family, considering all matrices in the...

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AMIS on-line!

February 15, 2012
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AMIS on-line!

After many delays and exchanges of emails, our AMIS paper with Jean-Marie Cornuet, Jean-Michel Marin and Antonietta Mira eventually made it into the Scandinavian Journal of Statistics. I am quite glad it is now published as it will publicize the method...

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If you have to use circles…

February 15, 2012
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If you have to use circles…

Stats Chat is an interesting kiwi site—managed by the Department of Statistics of the University of Auckland—that centers around the use and presentation of statistics in the media. This week there was an interesting discussion on one of those infographics … Continue reading →

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Beware the Friedman test!

February 14, 2012
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Beware the Friedman test!

In section 10.4.4 of Serious stats (Baguley, 2012) I discuss the rank transformation and suggest that it often makes sense to rank transform data prior to application of conventional ‘parametric’ least squares procedures such as t tests or one-way ANOVA. There are several advantages to this approach over the usual approach (which involves learning and applying a new test such as Mann-Whitney U,

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Introduction to R for software developers and data analysts

February 14, 2012
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If you're in the San Francisco Bay Area on March 10, the ACM organizing a course on R that you might want to check out. Robert Kabacoff, author of the useful Quick-R website and the book R in Action, will present the course "An introduction to R for software developers and data analysts". The course is sponsored by Revolution...

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Pricing defaultable discount bond with reduced form model

February 14, 2012
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Pricing defaultable discount bond with reduced form model

I often use R language to write "prototype" program. As you know, It has very high productivity and smart grammar. In this article, I would like to show you how to write the program to evaluate the price of defaultable bond by "reduced-form model".Before write a program, we need to understand how to price these bond.Under risk neutral measure, we can...

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R for Quants, Part I (B)

February 13, 2012
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R for Quants, Part I (B)

This is a continuation of the R workshop I’m teaching at the Baruch MFE program. This section discusses the programming …Continue reading »

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what does object oriented statistical programming really mean?

February 13, 2012
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(This article was first published on twotorials by anthony damico, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on his blog: twotorials by anthony damico. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL,...

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how to use the c (combine) function

February 13, 2012
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(This article was first published on twotorials by anthony damico, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on his blog: twotorials by anthony damico. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL,...

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R 2.14.2 and R 2.15.0 coming soon

February 13, 2012
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The R core group has announced release dates for the next two versions of R (with their code names): 2.14.2 "Gift-Getting Season" on Feb 29 (3rd anniversary of R-1.0.0!) 2.15.0 "Easter Beagle" on Mar 30 R 1.0.0 was released twelve years ago on February 29, 2000; this will be the third February 29 since then. (Hence Peter Dalgaard's little...

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