1341 search results for "how to import image file to R"

An Attempt At Replicating Flexible Asset Allocation (FAA)

October 20, 2014
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An Attempt At Replicating Flexible Asset Allocation (FAA)

Since the people at Alpha Architect were so kind as to feature my blog in a post, I figured I’d … Continue reading →

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R User Groups and "after hours" Creativity

October 16, 2014
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R User Groups and "after hours" Creativity

by Joseph Rickert There is something about R user group meetings that both encourages, and nourshies a certain kind of "after hours" creativity. Maybe it is the pressure of having to make a presentation about stuff you do at work interesting to a general audience, or maybe it is just the desire to reach a high level of play....

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Introducing the Reproducible R Toolkit and the checkpoint package

October 13, 2014
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Introducing the Reproducible R Toolkit and the checkpoint package

The ability to create reproducible research is an important topic for many users of R. So important, that several groups in the R community have tackled this problem. Notably, packrat from RStudio, and gRAN from Genentech (see our previous blog post). The Reproducible R Toolkit is a new open-source initiative from Revolution Analytics. It takes a simple approach to...

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Starting a GIS Investigation with R

October 13, 2014
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Starting a GIS Investigation with R

By Jian Li – Consultant, Shanghai. Geographical data is becoming increasingly important in understanding how we can predict and influence our impact on the world. Data on the location of individuals (be they migrating animals, humans stuck in traffic, or … Continue reading →

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Sensitivity and Elasticity of seasonal matrix model

October 13, 2014
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Sensitivity and Elasticity of seasonal matrix model

The previous article introduced the seasonal matrices and the population growth rate λ of imaginary annual plant.  In this article, let’s try the sensitivity analysis of these matrices and the … Continue reading →

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A Note on Tweedie

October 9, 2014
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A Note on Tweedie

by Joseph Rickert In a recent post I talked about the information that can be developed by fitting a Tweedie GLM to a 143 million record version of the airlines data set. Since I started working with them about a year or so ago, I now see Tweedie models everywhere. Basically, any time I come across a histogram that...

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What happens if we forget a trivial assumption ?

October 4, 2014
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What happens if we forget a trivial assumption ?

Last week, @dmonniaux published an interesting post entitled l’erreur n’a rien d’original  on  his blog. He was asking the following question : let , and denote three real-valued coefficients, under which assumption on those three coefficients does has a real-valued root ? Everyone aswered , but no one mentioned that it is necessary to have a proper quadratic equation,...

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seeking altruistic social scientists, demographers, survey researchers

September 30, 2014
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seeking altruistic social scientists, demographers, survey researchers

hi everyone, please share this:  if you are an experienced user of a publicly-available survey data set from any country or international organization, let's work together on some user-friendly code and a short blog post for http://asdfree.com.&nb...

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Deep Down Below – Using in-database analytics from within Tableau (with MADlib)

September 28, 2014
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Deep Down Below – Using in-database analytics from within Tableau (with MADlib)

Introduction Using Tableau for visualizing all kinds of data is quite a joy, but it’s not that strong on build-in analytics or predictive features. Tableaus integration of R was a huge step in the right direction (and I love it very much - see here, here and here) but still has some limitations (e.g. no RAWSQL...

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Stage abundances, eigenvector of population matrix

September 28, 2014
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Stage abundances, eigenvector of population matrix

The previous article introduced the seasonal matrices and the population growth rate λ of imaginary annual plant.  This article focuses on  the meaning of the eigenvector at first, and then … Continue reading →

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