1256 search results for "Excel"

Using R and snow on Ohio Supercomputer Center’s Glenn cluster

March 28, 2011
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Over the last several days, I have had the “pleasure” of getting parallel processing with R running on the the Ohio Supercomputer Center’s (OSC) Glenn cluster. I am working on a project that uses GenMatch from Sekhon’s Matching, which uses … Continue reading →

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R-bloggers: I’m syndicated!

March 27, 2011
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Today Left Censored became a contributor to R-Bloggers. If you’ve never heard of it, R-Bloggers is a blog aggregator that brings together R-related posts from a large number of blogs across the Internet. It’s an excellent resource for those who … Continue reading →

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How to backtest a strategy in R

March 26, 2011
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This is the third post in the Backtesting in Excel and R series and it will show how to backtest a simple strategy in R.  It will follow the 4 steps Damian outlined in his post on how to backtest a simple strategy in Excel.Step 1: Get the dataThe ...

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How to backtest a strategy in R

March 26, 2011
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This is the third post in the Backtesting in Excel and R series and it will show how to backtest a simple strategy in R.  It will follow the 4 steps Damian outlined in his post on how to backtest a simple strategy in Excel.Step 1: Get the dataThe ...

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Looking at the "Curse of Dimensionality" with R, foreach, and lattice

March 20, 2011
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Looking at the "Curse of Dimensionality" with R, foreach, and  lattice

Here are the results of a "Curse of Dimensionality" homework assignment for Terran Lane's Introduction to Machine Learning class. Pretty pictures, interesting results, and a good exercise in explicit parallelism with R. It's neat to see distance scaling linearly with standard deviation, and linearly with the Lth-root...

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Visualizing Growth of a Retail Chain

March 15, 2011
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Visualizing Growth of a Retail Chain

I am a regular reader of the FlowingData blog by Nathan Yau. It is an excellent reference for anyone interested in statistical visualization of data. One of his posts that caught my attention was a visualization of the growth of Walmart in the US. Given my research interests in retail, it was a fascinating insight

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Webinar on integrating R with applications, March 16

March 15, 2011
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A quick reminder that Revolution Analytics' CTO David Champagne will be hosting a live webinar tomorrow (March 16) on Integrating R into 3rd Party and Web Applications Using RevoDeployR. Designed for application developers, this webinar will cover publishing R scripts to the RevoDeployR server, and integrating their results into Web applications, Microsoft Excel, JasperReports Server and more. Complete details...

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Want to say one thing and the exact oppositive with strong confidence ?

March 15, 2011
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Want to say one thing and the exact oppositive with strong confidence ?

No need to do politics. Just take a statistical course. And I do not talk about misinterpretation of statistics, but I talk about the mathematical foundations of statistical tests. Consider the following parametric test, with a one-dimensional para...

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Things I wish I’d known before I started using R

March 12, 2011
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Things I wish I’d known before I started using R

I’ve been using R for a couple of years now.  This post is aimed at me a couple of years ago, or you if you’re just starting to use R and are pressed for time.  Here’s some things I wish I’d known in early 2009. Use a naming convention read.csv is a great function, but

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A Million Random Digits: review of reviews

March 4, 2011
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A Million Random Digits: review of reviews

Recently on his blog (here), Robin mentioned an amazing book, called "A Million Random Digits" published by RAND corporation. The book was initially published in 1955, but RAND published a nice (and expensive) second edition. A great thing is that ...

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