Monthly Archives: April 2010

Response to Flowingdata Challenge: Graphing obesity trends

April 29, 2010
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Response to Flowingdata Challenge: Graphing obesity trends

Nathan at Flowingata put up another interesting challenge today to improve the following graphic showing obesity trends in America. Here’s my attempt: I transposed the data so that the cohorts are on the X axis and each separate line represents an age group. So each line shows the percentage of obese people in a particular

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JAGS 2.0

April 29, 2010
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Is out. On sourceforge. Along with a new rjags. Thanks Martyn. I’m looking forward to working my way through some of the improvements, which includeblock-updating of parameters in GLMs more use of R’s d/p/q family of functions for den...

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Tipping heuristics

April 28, 2010
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Tipping heuristics

INCREDIBLY SIMPLE CALCULATIONS MADE SIMPLE Yes, we all know how to calculate 15% or 20% exactly, but it’s fun to use tipping heuristics and even more fun to make crowded graphs of how they compare to each other. (Sorry for the junky chart. Open for suggestions, in the words of Tom Waits.) Here are a

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Wavelet Spectrogram Non-Stationary Financial Time Series analysis using R (TTR/Quantmod/dPlR) with USDEUR

April 28, 2010
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Wavelet Spectrogram Non-Stationary Financial Time Series analysis using R (TTR/Quantmod/dPlR) with USDEUR

I've been doing some research lately regarding types of spectral imaging and decomposition techniques that apply to non-stationary signals. As mentioned earlier, one of the major problems with the simple fourier analysis is that the basis functions ext...

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R Beginner’s Guide Book Update 4/28/2010

April 28, 2010
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R Beginner’s Guide Book Update 4/28/2010

Update: Statistical Analysis with R is now available!I am writing to update you on the progress of my R Beginner's Guide book, which is to be published through Packt. I have really gotten to work over the past couple months and have recently completed ...

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R Beginner’s Guide Book Update 4/28/2010

April 28, 2010
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R Beginner’s Guide Book Update 4/28/2010

Update: Statistical Analysis with R is now available!I am writing to update you on the progress of my R Beginner's Guide book, which is to be published through Packt. I have really gotten to work over the past couple months and have recently completed ...

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Sweave vs. pgfSweave

April 28, 2010
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Sweave vs. pgfSweave

I think pgfSweave should replace the default of Sweave system because it brings significant improvements over the original Sweave. I certain have made it my default Sweave tool on my system.------------------------------- EDITED ON MAY 1, 2010 --------...

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Eclipse and StatET – a working environment for R

April 28, 2010
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How to use Eclipse and StatET to create a handy-dandy development environment for R. Using the Eclipse environment provides a nice colored-syntax script editor, an R console, and an object browser to let you peruse the variables you've put into memory....

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Annotating Lattice Box and Whisker Plots

April 28, 2010
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Annotating Lattice Box and Whisker Plots

bwplot annotation example Sometimes you want to add a little text to box and whisker plots produced by the lattice function bwplot(). Here is one approach. Could be optimized a bit more to reduce manual specification of some elements. Suggestions...

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Analysis of Covariance – Extending Simple Linear Regression

April 28, 2010
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Analysis of Covariance – Extending Simple Linear Regression

The simple linear regression model considers the relationship between two variables and in many cases more information will be available that can be used to extend the model. For example, there might be a categorical variable (sometimes known as a covariate) that can be used to divide the data set to fit a separate linear

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