1570 search results for "regression"

Get the party started

December 22, 2012
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Have you already used trees or random forests to model a relationship of a response and some covariates? Then you might like the condtional trees, which are implemented in the party package.In difference to the CART (Classification and Regression ...

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R Journal Volume 4, Issue 2

December 20, 2012
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The latest issue of the bi-annual, peer-reviewed journal about R, the R Journal, is now available for download. This issue includes three articles on graphics from R-core member and R Graphics author Paul Murrell. He writes about accessing individual elements of an R chart by the component names, drawing complex symbols with the polypath function (useful for map icons,...

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Turnovers are poison

December 20, 2012
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Turnovers are poison

This is probably a slightly useless post, but a bit of fun all the same. If nothing else, it allows me to take a stab at learning a bit more about logistic regression. I’m still trying to unravel the mystery of why the Bears lost to the Vikings two weeks ago. This mystery is compounded

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Generation of E-Learning Exams in R for Moodle, OLAT, etc.

December 20, 2012
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Generation of E-Learning Exams in R for Moodle, OLAT, etc.

(Guest post by Achim Zeileis) Development of the R package exams for automatic generation of (statistical) exams in R started in 2006 and version 1 was published in JSS by Gr?n and Zeileis (2009). It was based on standalone Sweave exercises, that can be combined …Read more »

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Italian elections (1)

December 19, 2012
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Italian elections (1)

You'd think that the last week before the holidays would be very quiet and not much would be going on. Well, if you did, you'd be wrong, I guess, as the last few days have been quite busy (for many reasons). Anyway, I managed to track down some be...

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Making Friends with Multicollinearity

December 18, 2012
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Not every system of independent variables can be decomposed into separate components, each with its own unique contribution.  Sometimes our individual variables behave “as a unit” and thus become so entangled that we cannot say where the effect of one variable begins and the effect of another variable ends.  In such cases, it might be best to ignore the ...

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analyze the behavioral risk factor surveillance system (brfss) with r and monetdb

December 17, 2012
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experimental.  the behavioral risk factor surveillance system (brfss) aggregates behavioral health data from 400,000 adults via telephone every year.  it's um *clears throat* the largest telephone survey in the world and it's gotta lotta uses...

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Fractional Logit Model with Python

December 16, 2012
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Fractional Logit Model with Python

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Matrix Algebra Useful for Statistics

December 16, 2012
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Matrix Algebra Useful for Statistics

I was having a conversation with an acquaintance about courses that were particularly useful in our work. My forestry degree involved completing 50 compulsory + 10 elective† courses; if I had to choose courses that were influential and/or really useful they would be Operations Research, Economic Evaluation of Projects, Ecology, 3 Calculus and 2 Algebras.

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The R journal – Volume 4/2, December 2012

December 16, 2012
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Download complete issue Refereed articles may be downloaded individually using the links below. Table of Contents Editorial 3   Contributed Research Articles What’s in a Name? Paul Murrell 5 It’s Not What You Draw,It’s What You Don’t Draw Paul Murrell 13 Debugging grid Graphics Paul Murrell and Velvet Ly 19 frailtyHL: A Package for Fitting...

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