373 search results for "evaluation"

Easy error propagation in R

January 22, 2015
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In a previous post I demonstrated how to use R’s simple built-in symbolic engine to generate Jacobian and (pseudo)-Hessian matrices that make non-linear optimization perform much more efficiently. Another related application is Gaussian error propagation. Say you have data from a set of measurements in variables x and y where you know the corresponding measurement errors (dx...

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An Introduction to Change Points (packages: ecp and BreakoutDetection)

January 21, 2015
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An Introduction to Change Points (packages: ecp and BreakoutDetection)

A forewarning, this post is me going out on a limb, to say the least. In fact, it’s a post/project … Continue reading →

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Building a choropleth map of Italy using mapIT

January 19, 2015
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Building a choropleth map of Italy using mapIT

In the R environment, different packages to draw maps a

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Using the microbenchmark package to compare the execution time of R expressions

January 14, 2015
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Using the microbenchmark package to compare the execution time of R expressions

I recently learned about the microbenchmark package while browsing through Hadley’s advanced R programming book. I’ve done some quick benchmarking using system.time() in a for loop and taking the average, but the microbenchmark function in the microbenchmark package makes this much easier. Hadley gives the example of taking the square root of a vector using the built-in...

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Balancing the Load | What’s New in RStudio Server Pro?

January 13, 2015
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Balancing the Load | What’s New in RStudio Server Pro?

As R users know, we’re continuously improving the RStudio IDE.  This includes RStudio Server Pro, where organizations who want to deploy the IDE at scale will find a growing set of features recently enhanced for them. If you’re not already familiar with RStudio Server Pro here’s an updated summary page and a comparison to RStudio

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Job Announcement: Up to 4 Post-doctoral positions

January 3, 2015
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Job Announcement Up to 4 Post-doctoral positions on com

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Measuring the execution time of recommender systems in R

December 25, 2014
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Measuring the execution time of recommender systems in R

This post is different from all others you’ve seen so far on this site. This is actually not a proper post, but a respond to a comment from my previous post Recommender Systems 101 – a...

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Recommender Systems 101 – a step by step practical example in R

December 24, 2014
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Recommender Systems 101 – a step by step practical example in R

Every one of us is unique! …You are unique!  there are sooo many people different from you… but at the same time, there are also A LOT that are damned similar to you… exhibiting the...

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Yikes…It’s Been Awile

December 16, 2014
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Apparently our last blog post was in August. Dang. Where did five months go? Blog guilt would be killing me, but I swear it was just yesterday that Mine posted. I will give a bit of review of some of … Continue reading →

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A comment on preparing data for classifiers

December 4, 2014
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A comment on preparing data for classifiers

I have been working through (with some honest appreciation) a recent article comparing many classifiers on many data sets: “Do we Need Hundreds of Classifiers to Solve Real World Classification Problems?” Manuel Fernández-Delgado, Eva Cernadas, Senén Barro, Dinani Amorim; 15(Oct):3133−3181, 2014 (which we will call “the DWN paper” in this note). This paper applies 179 Related posts:

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