Monthly Archives: August 2009

Everybody loves R

August 14, 2009
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I found this articles in The New York Times" and I thought it would be nice to share them, By ASHLEE VANCE published on January 6, 2009, check them out, both are pretty interesting:http://www.nytimes.com/2009/01/07/technology/business-computing/07progr...

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First 15 min. volatility impact on the day’s volatility

August 14, 2009
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First 15 min. volatility impact on the day’s volatility

One night I was hooked on this post at elitetrader. I spent couple of hours to find, that a guy is cheating a bit and he didn’t reveal his strategy. Not big deal – free lunch is rear. So, I googled about that guy and one thing catch my attention. In one of his post

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Example 7.10: Get data from R into SAS

August 13, 2009
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Example 7.10: Get data from R into SAS

In our previous entry, we described how to generate a dataset from SAS that could be used for analyses in R. Alternatively, someone primarily using R might want to test the new ”statistical graphics” procedures available starting with SAS 9.2. Her...

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ggplot2 Version of Figures in “Lattice: Multivariate Data Visualization with R” (Part 11)

August 13, 2009
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ggplot2 Version of Figures in “Lattice: Multivariate Data Visualization with R” (Part 11)

This is the 11th post in a series attempting to recreate the figures in Lattice: Multivariate Data Visualization with R (R code available here) with ggplot2. Previous parts in this series: Part 1, Part 2, Part 3, Part 4, Part 5, Part 6, Part 7, Part 8, Part 9, Part 10. Chapter 11 – Manipulating the “trellis”

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random 0.2.1

August 12, 2009
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A maintenance fix was applied to random: following the changes in release 0.2.0 a few months ago that reflected changes at the random.org site, we needed to make one more change in randomSequence. Thanks for Lynn Amon for spotting this. The new pac...

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Completion for java objects

August 9, 2009
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As indicated in this thread, completion after the dollar operator can be customized by defining a custom names method. Here I am showing how to take advantage of this to display fields and methods of java references (jobjRef objects from the rJava ...

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Example 7.9: Get data from SAS into R

August 8, 2009
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Example 7.9: Get data from SAS into R

Some people use both SAS and R in their daily work. They might be more familiar with SAS as a tool for manipulating data and R preferable for plotting purposes. While our goal in the book is to enable people to avoid having to switch back and forth, ...

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Trend Analysis with the Cox-Stuart test in R

August 8, 2009
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The Cox-Stuart test is defined as a little powerful test (power equal to 0.78), but very robust for the trend analysis. It is therefore applicable to a wide variety of situations, to get an idea of the evolution of values obtained. The proposed method is based on the binomial distribution. In R there is no function to perform a...

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Two-way analysis of variance: two-way ANOVA in R

August 7, 2009
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The one-way analysis of variance is a useful technique to verify if the means of more groups are equals. But this analysis may not be very useful for more complex problems. For example, it may be necessary to take into account two factors of variability to determine if the averages between the groups depend on the group classification...

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Additive vs. dominance two-allele genetic model by DIC

August 7, 2009
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Two-allele model has alleles A1 and A2 and genotypes A1A1, A1A2, and A2A2. This model can be fitted using only additive effect (restricted model) or additve+dominance effect. (full model) The later model has one parameter more than the former. I was using this model lately and got weird DIC results - the full model had less number...

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