April 2014

Shiny variance inflation factor sandbox

April 30, 2014 | Maxwell B. Joseph

In multiple regression, strong correlation among covariates increases the uncertainty or variance in estimated regression coefficients. Variance inflation factors (VIFs) are one tool that has been used as an indicator of problematic covariate collinearity. In teaching students about VIFs, it may be useful to have some interactive supplementary material so ... [Read more...]

Registration now open for useR! 2014 in LA

April 30, 2014 | David Smith

Join hundreds of other R users from around the world at the annual worldwide R user conference useR! 2014, to be held June 30 - July 3 at the UCLA campus in Los Angeles. Registration is now open for attendees. Advance registration for the conference is just $375 — and even less for academics ($250) and ... [Read more...]

SMART Hackathon 2014

April 30, 2014 | strictlystat

Today is our SMART group's 2014 Hackathon! We will be at an undisclosed location, just plugging away at code/packages/apps. The mission statement: There's no structure except that you have to work on a software project and you have to present what you accomplished or didn't at a subsequent SMART ... [Read more...]

A Shiny-app Serves as Shiny-server Load Balancer

April 30, 2014 | Huidong Tian

The Shiny-app on open-source edition Shiny-server has only one concurrent, which means it can run only for one user at a time point. But it can host multiple Shiny-apps, which can run synchronously. So, if we create severl Shiny-apps with different names but same function, then we can let more ... [Read more...]

Three Ways to Format R Code for Blogger

April 30, 2014 | Francis Smart

Unformatted CodeIf you are like me originally then you might not think it is worth it to spend the extra energy to format your code.  After all people can just copy what you have and paste it into their preferred editor which will do its own forma...
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April 30, 2014 | Dan Kelley Blog/R

Introduction Over the past month or so I have been trying different ways of handling GMT-style colormaps in Oce. I think my present solution is on the right track, but I am posting here to get more eyes on the problem. Note that the function called Colormap() here will be ... [Read more...]

brainR: Put your brain on the Cloud!

April 29, 2014 | strictlystat

In my work, we have come across problems where we wanted to visualize data in 4 dimensions (4D). The data came as brains, which are represented as 3D volumes and we wanted to visualize them at different time points (hence 4D). We were using images that are acquired one image per ... [Read more...]

“[” with the apply() functions, revisited

April 29, 2014 | Karl Broman

I’d mentioned in the fall that one could use "[" in the apply-type functions, like this: I just realized that you can use this with matrices, too. If you have a list of matrices, you can pull out rows and columns with this technique. As you can see, my data ... [Read more...]

Writing an R package from scratch

April 29, 2014 | hilaryparker

As I have worked on various projects at Etsy, I have accumulated a suite of functions that help me quickly produce tables and charts that I find useful. Because of the nature of iterative development, it often happens that I … Continue reading → [Read more...]

Slidify Old Book Images from Google Books

April 29, 2014 | klr

I really enjoy reading old books, especially finance books, from Google Books.  With all the changes in the world, their continued relevance amazes me.  For instance, as I prepared for my talk about Wealth and Skill, I rediscovered Developing Financi... [Read more...]

Predict which shoppers will become repeat buyers

April 29, 2014 | Joseph Rickert

by James P. Peruvankal Kaggle just announced a competition to predict which shoppers will become repeat buyers. To aid with algorithmic development, they have provided complete, basket-level, pre-offer shopping history for a large set of shoppers who were targeted for an acquisition campaign. Files containing the incentives offered to each ... [Read more...]

On Functional Diversity metrics

April 29, 2014 | ibartomeus

Summary: FD is getting very popular, so I figured that would be good to post not only the code (mostly borrowed) I am using: https://github.com/ibartomeus/fundiv, but also what I learnt of it. This posts assume you have read about FD calculation … Continue reading → [Read more...]

On the trade history and dynamics of NBA teams

April 28, 2014 | tlfvincent

While good draft picks and deft management can help you win championships, there is no doubt that NBA teams can massively gain, or lose, by trading players with one another. Here, I played around with some publicly available data given at basketball-reference.com, and had a look at the numbers ... [Read more...]
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