# Monthly Archives: August 2014

## RcppEigen 0.3.2.2.0

August 21, 2014
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A new upstream release of the Eigen C++ template library for linear algebra was released a few days ago. And Yixuan Qiu did some really nice work rolling this into a new RcppEigen released and then sent me a nice pull requent. The new version is now...

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## R in Production – Panel Discussion – LA R meetup @ useR! 2014

August 21, 2014
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(Please click here if the video above doesn’t load.) The video above is from an event...

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## R in Production – Opening Talk by Yasmin Lucero – LA R meetup @ useR! 2014

August 21, 2014
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(Please click here if the video above doesn’t load.) During useR! 2014, the LA R...

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## Impact of correlated predictions on the variance of an ensemble model

August 21, 2014
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$Impact of correlated predictions on the variance of an ensemble model$

Let and be the prediction errors of two statistical/machine learning algorithms. and have relatively low bias, and high variances and . They are also correlated, having a Pearson correlation coefficient equal to . Aggregating models and might result in a … Continue reading →

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## Revolution Analytics’ User Group Map Contest has a Winner

August 21, 2014
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by Joseph Rickert We are pleased to announce that Jo-fai Chow is the winner of the Revolution Analytics contest. Jo-fai’s entry, which was implemented as a Shiny project, may be viewed by clicking on the figure below. Jo-fai’s work not only produced an aesthetically pleasing sequence of maps but also provides a superb example of a well-documented, small project...

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## Extracting Latent Variables from Rating Scales: Factor Analysis vs. Nonnegative Matrix Factorization

August 21, 2014
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For many of us, factor analysis provides a gateway to learning how to run and interpret nonnegative matrix factorization (NMF). This post will analyze a set of ratings on a 218 item adjective checklist using both principal axis factor analysis and NMF....

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## Announcing dtupdate v1.0 – R Package Reporter/Updater for the devtools Universe

August 21, 2014
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The dtupdate package has functions that attempt to figure out which packages have non-CRAN versions (currently only looks for github ones) and then tries to figure out which ones have updates (i.e. the github version is __ local version). It provides an option (not recommended) to auto-update any packages with newer development versions. The reason auto updating is not...

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## Introducing R2D3

August 21, 2014
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R2D3 is a new package for R I’ve been working on. As the name suggests this package uses R to produce D3 visualisations. It builds on some work I previously blogged about here. There are some similar packages out there on CRAN already. Notably rjson and d3Network. However I found with these packages that they

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## Optimizing with R expressions

August 21, 2014
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I recently discovered a powerful use for R expression()’sSay you are trying to fit some experimental data to the following nonlinear equation: Ky0eu(x−tl)K+y0(eu∗(x−tl)−1)+b1+(b0−b1)e−kx+b2x with the independent variable x using nlminb() as the minimization optimizer.This sort of work is significantly improved (i.e. faster with better convergence) if an analytical gradient vector and a Hessian matrix for the objective function are provided. ...

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## For Loop Tracking (Windows Progress Bar)

August 20, 2014
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I know that many people consider for-loops the devil, but every so often I get lazy and I use them in the office.  Sometimes it’s nice to keep track of how far through the loop R has gone.  A couple years … Continue reading →

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