354 search results for "PCA"

The average Stripe employee! Congrats to Alyssa!

January 2, 2015
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The average Stripe employee! Congrats to Alyssa!

Recently, my colleague and fellow blogger Alyssa Frazee accepted a job at Stripe. All of us at JHU Biostat are happy for her, yet sad to see her go. While perusing Stripe’s website, I found the About page, where each employee has a photo of themselves. I’ve been playing around with some PCA and decompositions,

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Principal Component Analysis on Imaging

December 25, 2014
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Principal Component Analysis on Imaging

Ever wonder what's the mathematics behind face recognition on most gadgets like digital camera and smartphones? Well for most part it has something to do with statistics. One statistical tool that is capable of doing such feature is the Principal Component Analysis (PCA). In this post, however, we will not do (sorry to disappoint you) face recognition as...

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R: Principal Component Analysis on Imaging

December 25, 2014
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R: Principal Component Analysis on Imaging

Ever wonder what's the mathematics behind face recognition on most gadgets like digital camera and smartphones? Well for most part it has something to do with statistics. One statistical tool that is capable of doing such feature is the Principal Component Analysis (PCA). In this post, however, we will not do (sorry to disappoint you) face recognition as we...

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Archetypal Analysis: Similarity Defined by Distances from Contrasting Ideals

December 5, 2014
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Archetypal Analysis: Similarity Defined by Distances from Contrasting Ideals

Carl Jung was at least partially correct. We do tend to think in terms of the extremes as shown in this archetypal wheel with rulers versus outlaws and heroes versus caregivers at different ends of bipolar dimensions. Happily, we are not required to ac...

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Mirror, mirror on the wall, which is your favorite German car brand in the world…

October 30, 2014
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Mirror, mirror on the wall, which is your favorite German car brand in the world…

Or how to create a world map in R with survey data, World Bank indicators, ggplot2 and rworldmap by timwinke When people think about Germany, what comes to their mind? Oktoberfest, ok – but Mercedes might be second or BMW … Continue reading →

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Some R Highlights from the Bay Area Data Science Camp and Unconference

October 30, 2014
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Some R Highlights from the Bay Area Data Science Camp and Unconference

by Joseph Rickert The San Francisco Bay Area Chapter of the Association of Computing Machinery (ACM) has been holding an annual Data Mining Camp and "unconference" since 2009. This year, to reflect the times, the group held a Data Science Camp and unconference, and we at Revolution Analytics were, once again, very happy to be a sponsor for the...

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Rock around the data clock

October 21, 2014
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Rock around the data clock

I had to visualize an hourly distribution of some KPI (assume logins / registrations / purchases per hour), so the idea was, why not build a clock? It’s a nice and intuitive way to present this data. The problem is, that the clock has only 12 hours which are used twice a day, so I will have to assign...

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Add external code to Rmarkdown

October 21, 2014
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Ever been in a position to write a documentation or report about complex R code? Take a Shiny dashboard for example, or other big projects. Maybe you heard it already, with RMarkdown you can simply write markdown code, add some R code to it and render it to pdf, static websites or even presentations. I don’t want to...

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methylKit for bisulfite sequencing data analysis

October 21, 2014
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I have been relying upon methylKit, an R package for my RRBS data analysis. It is one the most highly cited R package for analysing bisulifite sequencing data. It is straight forward to install and it's vignette details all the major steps in the ...

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Twitter Pop-up Analytics

October 20, 2014
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Twitter Pop-up Analytics

IntroductionSo I've been thinking a lot lately. Well, that's always true. I should say, I've been thinking a lot lately about the blog. When I started this blog I was very much into the whole quantified self thing, because it was new to me, I liked the...

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