1233 search results for "Excel"

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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Video Introduction to R Packages by Rory Winston – Melbourne R Users February 2011

March 3, 2011
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Video Introduction to R Packages by Rory Winston – Melbourne R Users February 2011

On February 17th 2011 Rory Winston gave a talk on creating R packages at the Melbourne R Users Group (see Meetup page). Slides from the talk can be downloaded here. For more information about Rory check out his blog The … Continue reading →

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Keep an Eye on the emerging Open-Source Analytics Stack

March 3, 2011
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This post is contributed by Revolution Analytics CEO Norman Nie, and cross-posted from the Future of Open Source Forum. A lot of attention has been focused recently on Big Data, and rightly so: Big Data is a Big Deal. (See this LinuxInsider article, Big Data, Big Open Source Tools, for a compehensive overview of Big Data issues.) But what,...

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I love RStudio

March 1, 2011
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I love RStudio

Typically if I am working with R I will have a lot of different windows open all at once. I'll have the R Console (for Mac) of course and a text editor (Xcode or TextEdit), plus there will usually be some help windows to examine particular functions o...

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