Monthly Archives: March 2013

Happy St Patrick’s Day

March 17, 2013
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Happy St Patrick’s Day

I love Saint Patrick’s Day for, at least, two reasons. The first one is that, on March 17th, you can play out loud The Pogues, the second one is that it’s the only day in the year when I really enjoy getting a Guiness in a pub. And Guiness is important in statistical science (I did mention a couple...

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caretEnsemble Classification example

March 16, 2013
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caretEnsemble Classification example

Here's a quick demo of how to fit a binary classification model with caretEnsemble.  Please note that I haven't spent as much time debugging caretEnsemble for classification models, so there's probably more bugs than my last post.  ...

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Blend what?

March 16, 2013
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Why?Over the years I have learned quite a few things about machine learning but I have never thought of writing them down properly. Too often I can't figure out exactly what I did when I look at my old codes. The time is NOW!More importantly, I have fa...

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GNU R loop speed comparison

March 16, 2013
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GNU R loop speed comparison

Recently I had several discussions about using for loops in GNU R and how they compare to *apply family in terms of speed. I have not seen a direct benchmark comparing them so I decided to execute one (warning: some of the code presented today tak...

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Scholarly metadata in R

March 16, 2013
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Scholarly metadata in R

Scholarly metadata - the meta-information surrounding articles - can be super useful. Although metadata does not contain the full content of articles, it contains a lot of useful information, including title, authors, abstract, URL to the article, etc. One of the largest sources of metadata is provided via the Open Archives Initiative Protocol for Metadata Harvesting or OAI-PMH....

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Changing Axis Values in R Plot

March 15, 2013
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Changing Axis Values in R Plot

A colleague asked me for how one can change axis attributes in a basic plot. Plotting anything in R is really, really easy. It is enough typing plot(x, y). In general, plot functions are nicely pre-cooked, so hardly one needs to change anything. But if changes in the default attributes are needed, it is possible

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Evaluation of Orthogonal Signal Correction for PLS modeling (OSC-PLS and OPLS)

March 15, 2013
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Evaluation of Orthogonal Signal Correction for PLS modeling (OSC-PLS and OPLS)

Partial least squares projection to latent structures or PLS is one of my favorite modeling algorithms. PLS is an optimal algorithm for predictive modeling using wide data or data with  rows << variables. While there is s a wealth of literature regarding the application of PLS to various tasks, I find it especially useful for biological

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How Did I Miss “The Golden Dilemma”?

March 15, 2013
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How Did I Miss “The Golden Dilemma”?

I am ashamed to admit that I am way behind (about 10,127 downloads) in discovering this wonderful paper: The Golden Dilemma (January 8, 2013)Erb, Claude B. and Harvey, Campbell R.Available at SSRN: http://ssrn.com/abstract=2078535 Here are the authors presenting the concept in July 2012 if you prefer slideshow format (thanks...

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How do I make my graphs?

March 15, 2013
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How do I make my graphs?

Someone who wishes to remain anonymous writes: I’ve been following your blog a long time and enjoy your posts on visualization/statistical graphics matters. I don’t recall however you ever describing the details of your setup for plotting. I’m a new R user (convert from matplotlib) and would love to know your thoughts on the ideal The post How...

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Calender Heatmap with Google Analytics Data

March 15, 2013
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Calender Heatmap with Google Analytics Data

As data analytics consulting firm, we think we are fortunate that we keep finding problems to find. Recently my team mate found a glaring problem of not having any connector for R with Google. With the inspiration from Michael, Ajay O, it soon become a worth problem to solve. With RGoogleAnalytics package now, we have

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