152 search results for "heatmap"

Presidential Debates 2012

October 23, 2012
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Presidential Debates 2012

I have been playing with the beta version of qdap utilizing the presidential debates as a data set. qdap is in a beta phase lacking documentation though I’m getting there. In previous blog posts (presidential debate 1 LINK and VP … Continue reading →

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Color Palettes in HCL Space

October 12, 2012
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Color Palettes in HCL Space

This is a quick follow-up to my previous post about Color Palettes in RGB Space. Achim Zeileis had commented that, perhaps, it would be more informative to evaluate the color palettes in HCL (polar LUV) space, as that spectrum more accurately describes how humans perceive color. Perhaps more clear trends would emerge in HCL space,

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Making Color Ramps in Matlab

October 9, 2012
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When visualizing an array of data in a heatmap, a good color map makes a world of difference.Thanks to my work in 'omics (i.e. transcriptomics - microarrays and RNASeq) I've looked at a lot of heatmaps over the past couple of years, and generated quite...

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What’s in My Pocket? Read it now! (or Read It Later)

October 9, 2012
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What’s in My Pocket? Read it now! (or Read It Later)

IntroductionYou know what's awesome? Pocket.I mean, sure, it's not the first. I think Instapaper existed a little before (perhaps). And there are alternatives, like Google Reader. But Pocket is still my favorite. It's pretty awesome at what it does.Pocket (or Read It Later, as it used to be known) has fundamentally changed the...

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EDA Before CDA

October 6, 2012
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EDA Before CDA

One Paragraph Summary Always explore your data visually. Whatever specific hypothesis you have when you go out to collect data is likely to be worse than any of the hypotheses you’ll form after looking at just a few simple visualizations of that data. The most effective hypothesis testing framework in existence is the test of

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DIY ZeroAccess GeoIP Plots

October 5, 2012
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DIY ZeroAccess GeoIP Plots

Since F-Secure was #spiffy enough to provide us with GeoIP data for mapping the scope of the ZeroAccess botnet, I thought that some aspiring infosec data scientists might want to see how to use something besides Google Maps & Google Earth to view the data. If you look at the CSV file, it’s formatted as

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A replacement for theme_blank()

October 2, 2012
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A replacement for theme_blank()

ggplot2 has just hit 0.9.2, and with the change comes a new theme system. Previous versions of ggplot2 offered a theme_blank(), which was a stripped-down, essentially blank plotting canvas, but it is now deprecated. github user jrnold has produced a s...

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Optimal seriation for your matrices

September 28, 2012
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Optimal seriation for your matrices

In our previous post, we used a quick-and-dirty method for ordering the axes on our heatmap. It has been pointed out to me that There is a Package for That (which is my nominee for a new slogan for R — not that it needs a slogan). seriation offe...

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Designing Data Apps with R at Periscopic

September 18, 2012
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Designing Data Apps with R at Periscopic

Today's guest post comes to us from Andrew Winterman, Data Designer at data visualization company Persiscopic. He shares with us the process of using the R language and other tools to create an interactive data application for a client — ed. The Hewlett Foundation contacted us a few months ago because they were interested in exploring ways to visualize...

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Tutorials for Learning Visualization in R

September 12, 2012
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Tutorials for Learning Visualization in R

Today's guest post comes from Nathan Yau. Nathan runs FlowingData, a site on statistics and visualization, and is the author of Visualize This. Years ago, when I started FlowingData, the purpose of the blog was to catalog and think out loud about visualization, in its many varieties. In the beginning I was talking to myself for the most part,...

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