Monthly Archives: November 2011

Wicked Webapps with R, err, Wt

November 30, 2011
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Wicked Webapps with R, err, Wt

A few months ago, I had blogged about using R inside of Qt. This used our RInside package for embedding the statistical programming environment and language R inside of a C++ application, and further relies on our Rcpp package for R and C++ integrati...

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A look at market returns by month

November 30, 2011
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A look at market returns by month

I’ve been reading The Big Picture, and again, there was a discussion about seasonality in stock markets (see Fourth Quarter is Da Bomb). I’ve already discussed the two seasonal investment scenarios (Nov. to Apr VS May to Oct) in this post, and was wondering if one could break it down further into a monthly analysis.

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mean of an absolute Student’s t

November 30, 2011
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mean of an absolute Student’s t

Having (rather foolishly) involved myself into providing an answer for Cross Validated: “Can the standard deviation of non-negative data exceed the mean?“, I ended up having to derive the mean of the absolute value of a Student’s variate X.  (Well, not really, but then I did.) I think the following is correct: where is the

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Earthquakes

November 30, 2011
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Earthquakes

> data(quakes)> head(quakes) lat long depth mag stations 1 -20.42 181.62 562 4.8 41 2 -20.62 181.03 650 4.2 15 3 -26.00 184.10 42 5.4 43 4 -17.97 181.66 626...

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Tips for getting started on Kaggle (datamining)

November 30, 2011
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Tips for getting started on Kaggle (datamining)

Ever since I heard about Kaggle.com at this year's Bay Area Data Mining Camp, I've wanted to participate. But I was feeling somewhat intimidated. Jeremy Howard's "Intro to Kaggle" talk at yesterday's MeetUp (DataMining for a Cause) was exactly what I...

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rOpenSci won 3rd place in the PLoS-Mendeley Binary Battle!

November 30, 2011
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rOpenSci won 3rd place in the PLoS-Mendeley Binary Battle!

I am part of the rOpenSci development team (along with Carl Boettiger, Karthik Ram, and Nick Fabina).   Our website: http://ropensci.org/.  Code at Github: https://github.com/ropensciWe entered two of our R packages for integrating with ...

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Free ggplot2 webinar from Hadley Wickham

November 30, 2011
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The Orange County R Users Group is hosting a free webinar presented by Hadley Wickham, author of the ggplot2 graphics package for R. The webinar, "Advanced Visualizations in R with Hadley Wickham" is live from 6PM-7PM Pacific Time tomorrow, December 1. You can register at the LinkedIn event page below, as long as there are spaces left (it's limited...

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rOpenSci is a runner-up in the Mendeley Binary Battle!

November 30, 2011
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We just got word that rOpenSci was a runner-up in the first Binary Battle!  Thank you for all the support so far! We entered two of our packages for integrating with PLoS Journals (rplos) and Mendeley (RMendeley) in the Mendeley-PLoS Binary Battle.  Get them at GitHub (rplos; RMendeley). These two packages allow users to search and retrieve

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GUI for sending email in R (using sendEmail)

November 30, 2011
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GUI for sending email in R (using sendEmail)

After writing the last post on using sendEmail to send email from R I decided to create a simple GUI to enable this functionality. A snapshot image of the GUI is shown above. To use this GUI, you will need to install the following packages in R: gWidgets gWidgetsRGtk2 Windows GTK Bundle More information on

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Alpha decay in portfolios

November 30, 2011
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Alpha decay in portfolios

How does the effect of our expected returns change over time?  This is not academic  curiosity, we want to know in the context of our portfolio if we can.  And we can — we visualize the effect of expected returns in situ. First step The idea is to look at the returns of portfolios that … Continue reading...

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