2839 search results for "ggplot2"

RStudio Webinar with Hadley Wickham: The Grammar and Graphics of Data Science

July 17, 2014
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RStudio Webinar with Hadley Wickham: The Grammar and Graphics of Data Science

RStudio has recently announced a series of free webinars open to the public. The first of these seminars is given by Hadley Wickham, Rice University Professor, RStudio Chief Scientist, and general super-star of the R development world. Contributing aut...

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Why hadn’t I written a function for that?

July 16, 2014
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Why hadn’t I written a function for that?

I’m often typing the same bits of code over and over. Those bits of code really should be made into functions. For example, I’m still using base graphics. (ggplot2 is on my “to do” list, really!) Often some things will be drawn with a slight overlap of the border of the plotting region. And in

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Pick a Color Site built in R with Shiny tags %$%

July 16, 2014
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I started down the color path with yesterday’s post Palette of Colors from Image %>% ggplot2 %>% rCharts + dimple.js.  Although R has lots of tools, such as RColorBrewer and the mentioned rPlotter, javascript does too with Gregor Aisch's chroma.js and this translated-from-Perl color-scheme-js. I figured I should explore these javscript color tools but not in the easy way. ...

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Presentations and video of the 5th meeting

July 15, 2014
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Great success for the 5th MilanoR meeting. At links below, you find speech presentations. Please leave a comment! Welcome Presentation by Nicola Sturaro, consultant at Quantide Singular Spectrum Analysis With Rssa by Maurizio Sanarico, Chief Data Scientist at SDG consulting … Continue reading →

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The Zebra Of Riemann

July 13, 2014
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The Zebra Of Riemann

Mathematics is the art of giving the same name to different things (Henri Poincare) Many surveys among experts point that demonstration of the Riemann Hypothesis is the most important pending mathematical issue in this world. This hypothesis is related to Riemann zeta function, which is supossed to be zero only for those complex whose real part is equal to

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Item Response Theory and Item Information Exploration

July 10, 2014
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Item Response Theory and Item Information Exploration

In the following post I will map out some item information functions for item response theory (IRT) models using the common 3 parameter logistic model for binary responses. The model takes three parameters (obviously) which relate to the item features ...

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In case you missed it: June 2014 Roundup

July 9, 2014
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In case you missed them, here are some articles from June of particular interest to R users: The useR! 2014 conference in Los Angeles opened with 16 tutorials. DataInformed published an article by David Smith on how various companies use R. Joe Rickert reviews the new book "Applied Predictive Modeling" by Max Kuhn and Kjell Johnson, which is rich...

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Dependencies of popular R packages

July 8, 2014
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Dependencies of popular R packages

With the growing popularity of R, there is an associated increase in the popularity of online forums to ask questions. One of the most popular sites is StackOverflow, where more than 60 thousand questions have been asked and tagged to be related to R. On the same page, you can also find related tags. Among the top 15 tags...

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How to pick up 3 numbers from a uniform distribution in a transparent manner?

July 7, 2014
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How to pick up 3 numbers from a uniform distribution in a transparent manner?

Over in my previous post, I’m giving away 3 copies of my video course on ggplot2 and shiny. To win a copy, you just need to leave a comment and I will select 3 winners among the n participants at … Continue reading →

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Automatic bias correction doesn’t fix omitted variable bias

July 4, 2014
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Automatic bias correction doesn’t fix omitted variable bias

Page 94 of Gelman, Carlin, Stern, Dunson, Vehtari, Rubin “Bayesian Data Analysis” 3rd Edition (which we will call BDA3) provides a great example of what happens when common broad frequentist bias criticisms are over-applied to predictions from ordinary linear regression: the predictions appear to fall apart. BDA3 goes on to exhibit what might be considered Related posts:

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