Monthly Archives: February 2010

Artificial Immune Systems and Financial Applications?

February 11, 2010
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Artificial Immune Systems and Financial Applications?

One of the buzzwords that seems to be common these days is AIS or Artificial Immune Systems. It is a biologically inspired classification type system that essentially tries to replicate some of our own natural immune system algorithms. Our bodies hav...

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Running totals in R

February 11, 2010
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Running totals in R

Learn about the cumsum function in R for running totals

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Using J48 Decision Tree Classifier to Dynamically Allocate Next Day Position in Stocks or Bonds

February 11, 2010
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Using J48 Decision Tree Classifier to Dynamically Allocate Next Day Position in Stocks or Bonds

The prior introduction using a simple model to determine next weeks change based on the S&P 500 index and VIX did not look very promising, although hopefully it served to familiarize yourself with how classification is used in augmenting trading decisi...

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Two New Soils-Related KMZ Demos

February 10, 2010
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Two New Soils-Related KMZ Demos

LCC KMZ Soil Texture KMZ   Forgot to post these KMZ files: 1-km scale, aggregate LCC and soil texture data, derived from SSURGO. These are part of a series of KMZ / raster...

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Video: What is R?

February 10, 2010
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By popular demand, we've made the video of our 30-minute webcast "The R Project" available on YouTube so that everyone can easily watch it. If you (or a friend!) have ever wondered what this R thing is all about, this is the video for you. Here's the first part: Because of YouTube restrictions it's split up into four parts,...

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Loglinear models using R

February 10, 2010
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Loglinear models using R

For those sociologists who want to estimate complicated loglinear models (e.g. Goodman's RC model) using R, the package "VGAM" seems to be a good choice.

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Speeding up simulations with Amazon EC2

February 10, 2010
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Over at Cerebral Mastication, JD Long tells a characteristically entertaining and informative story about how he uses R to run stochastic simulations of insurance portfolios and reinsurance treaties. A typical job involves 10,000 simulations, and when each estimate takes over 20 seconds you're talking some serious time to get the job done. Fortunately, this is the kind of problem...

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Tracking Climate Trends with RClimate Scripts and Links

February 10, 2010
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Tracking Climate Trends with RClimate Scripts and Links

Some of my visitors may have noticed that I have added a new Climate Images page and have been adding climate data images to my right side panel. So far, I have 6 trend charts, 4 map images, 1 photo image and 1  data value  showing the CO2 concentrations, recent total solar irradiance (TSI) ,

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RClimate Script: Arctic Sea Ice Extent Trend By Month

February 10, 2010
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RClimate Script: Arctic Sea Ice Extent Trend By Month

This RClimate Script lets users retrieve and plot the latest data on Arctic Sea Ice Extent  trends by month from 1979 to latest completed month. The trend chart shows National Snow and Ice Data Center’s (NSIDC)  monthly Arctic Sea Ice extent data. Arctic Sea Ice Trend by Month I’ve discussed the Arctic sea ice extent

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LocusZoom: Plot regional association results from GWAS

February 10, 2010
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Update Friday, May 14, 2010: See this newer post on LocusZoom. If you caught Cristen Willer's seminar here a few weeks ago you saw several beautiful figures in the style of a manhattan plot, but zoomed in around a region of interest, with several ot...

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