Monthly Archives: April 2010

New version of R package futile released

April 6, 2010
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The latest version of futile was released to CRAN yesterday. This release broke out the various functions into self-contained sub-packages …Continue reading »

Cherry Picking to Generalize ~ NASA Global Temperature Trends

April 6, 2010
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The relatively (to this decade) cool 2008 global temperatures spurred talks of a warming pause, or even global cooling. The claim usually comes from people who cherry picked either data sets and(!)/or start and end points of the global temperature trends to back up their allegation. The blogosphere already has a lot on this: Skeptical

Le Monde rank test (corr’d)

April 6, 2010
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$Le Monde rank test (corr’d)$

Since my first representation of the rank statistic as paired was incorrect, here is the histogram produced by the simulation perm=sample(1:20) saple=sum(abs(sort(perm)-sort(perm))) when . It is obviously much closer to zero than previously. An interesting change is that the regression of the log-mean on produces > lm(log(memean)~log(enn)) Call: lm(formula = log(memean) ~ log(enn)) Coefficients: (Intercept)

R package Blotter

April 6, 2010
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How many times have you been disappointed by nice trading system, because neither trading cost or slippage or bid/ask spread were included into back-test results? Did you find difficult to back-test a portfolio in R or many portfolios with different stocks? Blotter package is supposed to solve these problems. In really – it is complicated. I

ProbABEL – R package for GWAS data imputation

April 6, 2010
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I've been using GenABEL for some time now for GWAS analysis using related individuals. It has an excellent set of functions for estimating a kinship matrix from a dense marker panel and then using this in a linear mixed effects model to allow for relat...

New R User Group in Chicago

April 6, 2010
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While there's been an informal coterie of R users in the Chicago area for some time (notably the fine folks behind the successful R/Finance conferences) there hasn't been a formal R User Group. Until now, that is. JD Long has taken the plunge and announced the new Chicago R User Group on meetup.com. If you're in the Chicagoland area,...

Visualizing Arctic Sea Ice Extent Trends

April 6, 2010
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Reader GH sent me an e-mail asking about a previous Arctic sea ice extent trend post (click). GH asked …. “Why is there such a difference between this type of representation and the chart at link ? What you’ve written … Continue reading →

Rules of Thumb to Meet R Gurus in the Help List

April 5, 2010
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Here is my personal list of rules of thumb for people who want to meet some R gurus (quickly) in the R help mailing list ([email protected]): If you want to meet Dr Bill Venables, just say something about Type III Sum of Squares (better if you also mention the “unbeatable” SAS); If you want to

R Tools for Dynamical Systems ~ R pplane to draw phase planes

April 5, 2010
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$R Tools for Dynamical Systems ~ R pplane to draw phase planes$

MATLAB has a nice program called pplane that draws phase planes of differential equations models. pplane on MATLAB is an elaborate program with an interactive GUI where you can just type the model to draw the phase planes. The rest you fidget by clicking (to grab the initial conditions) and it draws the dynamics automatically.