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

‘Open sourcing’ microsimulation with R

October 23, 2014
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‘Open sourcing’ microsimulation with R

These are the slides from a presentation today at the European conference of the IMA, held in Maastricht, 23rd to 24th October, 2014. Microsimulation, as its name suggests, is about modelling things at the individual-level. In practice, this usually means estimating the characteristics of people using statistical or econometric techniques. Microsimulation, as represented by the International Microsimulation Association...

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Leveraging R for Econ Job Market

October 23, 2014
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Leveraging R for Econ Job Market

I wanted to describe a little helper I am using to help refine the places I want to apply at since I am going to be on the Economics Job Market this year. The two main websites were job openings are advertised are: EconJobMarket Job Openings for Economists Now JOE has a really nice feature

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Modeling Plenitude and Speciation by Jointly Segmenting Consumers and their Preferences

October 21, 2014
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Modeling Plenitude and Speciation by Jointly Segmenting Consumers and their Preferences

In 1993, when music was sold in retail stores, it may have been informative to ask about preference across a handful of music genre. Today, now that the consumer has seized control and the music industry has responded, the market has exploded into more...

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The lapply command 101

October 20, 2014
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The lapply command 101

Next up in our review of the family of apply commands we’ll look at the lapply function, which can be used to loop over the elements of a list (or a vector). This is a true convenience although for those with experience in other programming languages it can seem unnecessary since you are accustomed to

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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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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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