Monthly Archives: February 2010

Two-way Analysis of Variance (ANOVA)

February 15, 2010
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Two-way Analysis of Variance (ANOVA)

The analysis of variance (ANOVA) model can be extended from making a comparison between multiple groups to take into account additional factors in an experiment. The simplest extension is from one-way to two-way ANOVA where a second factor is included in the model as well as a potential interaction between the two factors. As an example

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R vs. Matlab – a small example

February 15, 2010
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R vs. Matlab – a small example

At the institute I’m working quite a lot of people prefer using Matlab and only a few of them know about R. Today one of my colleagues — who is also an eager user of Matlab — ran into the following problem: He had a vector in hand which consisted of elements. He wanted to

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Bay Area meet-up Tuesday: John Chambers speaks, cocktail reception

February 15, 2010
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At tomorrow's meeting of the Bay Area R User's Group, ACM Software Systems award winner and R Core Group member John Chambers will give a keynote talk on the R language. The talk, titled Interfaces and Paradigms, will explore choices for computing with data with visits along the way to the history of R, reasons for the growth of...

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Rcpp 0.7.7

February 14, 2010
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pre{ border: 1px solid black ; font-size: small ; } A good 2 days after 0.7.6 was released, here comes Rcpp 0.7.7. The reason for this release is that a subtle bug installed itself and we did not catch it in time The new version also includes ...

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Cure model using R

February 13, 2010
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Cure model using R

The package "nltm" seems to be able to estimate proportional hazard and proportional odds cure models. I will do some experiments and see how it goes.

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Rcpp 0.7.6

February 13, 2010
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The new 0.7.6 release of Rcpp, our set of R / C++ interface classes, is now at CRAN and Debian. This comes just a few days after 0.7.5 as we had made a mistake in Makefile.win which is now fixed. A few other things sneaked in while were at it, see th...

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highlight 0.1-5

February 13, 2010
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pre{ border: 1px solid black ; font-size: small; } I've pushed the version 0.1-5 of highlight to CRAN, it should be available in a couple of days. This version fixes highlighting of code when one wants to display the prompt and the continue pr...

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Exact Complexity of Mergesort, and an R Regression Oddity

February 13, 2010
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Exact Complexity of Mergesort, and an R Regression Oddity

It’s nice to be back after a pretty crazy two weeks or so. Let me start off by stating that this blog post is simply me pondering and may not be correct. Feel free to comment on inaccuracies or improvements! In preparation for an exam and my natural tendencies to be masochistic, I am forcing myself to find the exact...

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Introduce your friends to R

February 12, 2010
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http://blog.revolution-computing.com/2010/01/introduce-your-friends-to-r.htmlhttp://www.typepad.com/services/trackback/6a010534b1db25970b0120a7ed6fd2970b

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R – Sorting a data frame by the contents of a column

February 12, 2010
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R – Sorting a data frame by the contents of a column

Learn about data frames, selecting columns, and sorting data frames by given columns

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