Monthly Archives: March 2012

R script to calculate QIC for Generalized Estimating Equation (GEE) Model Selection

March 23, 2012
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R script to calculate QIC for Generalized Estimating Equation (GEE) Model Selection

Generalized Estimating Equations (GEE) can be used to analyze longitudinal count data; that is, repeated counts taken from the same subject or site. This is often referred to as repeated measures data, but longitudinal data often has more repeated obse...

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Gini Efficient Frontier

March 23, 2012
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Gini Efficient Frontier

David Varadi have recently wrote two posts about Gini Coefficient: I Dream of Gini, and Mean-Gini Optimization. I want to show how to use Gini risk measure to construct efficient frontier and compare it with alternative risk measures I discussed previously. I will use Gini mean difference risk measure – the mean of the difference

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Serious stats – free statistics resources

March 23, 2012
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The companion web site for Serious Stats is now live:http://www.palgrave.com/psychology/baguley/The web site includes:- a free sample chapter (Chapter 15: Contrasts)- data sets- R scripts- 5 online supplements (for meta-analysis, multiple imputation, r...

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Serious stats companion web site now live: sample chapter, data and R scripts

March 23, 2012
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Serious stats companion web site now live: sample chapter, data and R scripts

The companion web site for Serious stats is now live: http://www.palgrave.com/psychology/Baguley/ It includes a sample chapter (Chapter 15: Contrasts), data sets, R scripts for all the examples and supplementary material. Filed under: news, R code, ser...

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Dissimilarity Between Soil Profiles: A Closer Look

March 23, 2012
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Dissimilarity Between Soil Profiles: A Closer Look

Continuing the previous discussion of pair-wise dissimilarity between soil profiles, the following demonstration (code, comments, and figures) further elaborates on the method. A more in-depth discussion of this example will be included as a vignette w...

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Launching iButton Thermochrons with the help of R

March 23, 2012
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Maxim's iButton Thermochron temperature dataloggers are little silver doo-dads the size of a large watch battery that can record up to 2048 time-stamped temperature values. The internal battery is usually good for a few years of use. Maxim supplies a J...

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R in Google Summer of Code 2012

March 23, 2012
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This post is a slightly revised (and "blogified") version of the message Brian Peterson has sent to various R mailing lists.Once again, R has been accepted as a mentoring organization for the Google Summer of Code (2012).  We invite students interested in this program to learn more about it.  A good starting point...

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RStudio Development Environment

March 23, 2012
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RStudio Development Environment

Compared to many other languages of equal popularity, there are realtively few development environments for R. In fact, the total number of production ready R IDEs could probably be counted on one hand. That deficiency is a small price to pay to use R ...

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R, Twitter and McDonald’s

March 23, 2012
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R, Twitter and McDonald’s

Ed Chen is a data scientist at Twitter, so he's accustomed to working with big data and complex models. In an interview with MIT Technology Review, he describes his data science toolbox: A common pattern for me is that I'll code a MapReduce job in Scala, do some simple command-line munging on the results, pass the data into Python...

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This graph shows that President Obama’s proposed budget treats the NIH even worse than G.W. Bush – Sign the petition to increase NIH funding!

March 23, 2012
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This graph shows that President Obama’s proposed budget treats the NIH even worse than G.W. Bush – Sign the petition to increase NIH funding!

The NIH provides financial support for a large percentage of biological and medical research in the United States. This funding supports a large number of US jobs, creates new knowledge, and improves healthcare for everyone. So I am signing this petiti...

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