3109 search results for "MAP"

PCA / EOF for data with missing values – a comparison of accuracy

September 15, 2014
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PCA / EOF for data with missing values – a comparison of accuracy

Not all Principal Component Analysis (PCA) (also called Empirical Orthogonal Function analysis, EOF) approaches are equal when it comes to dealing with a data field that contain missing values (i.e. "gappy"). The following post compares several methods by assessing the accuracy of the derived PCs to reconstruct the "true" data set, as was similarly...

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Departure of 2014 US Open Tennis Players

September 14, 2014
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Departure of 2014 US Open Tennis Players

This was generated using R and ggplot2. The code and details are coming soon. Departure of 2014 US Open Tennis Players was originally published by Vivek Patil at Adventures in Analytics and Visualization on September 15, 2014.

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Using colorized PNG pictograms in R base plots

September 12, 2014
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Using colorized PNG pictograms in R base plots

Today I stumbled across a figure in an explanation on multiple factor analysis which contained pictograms.   Figure 1 from Abdi & Valentin (2007), p. 8. I wanted to reproduce a similar figure in R using pictograms and additionally color them e.g. by group membership . I have almost no knowledge about image processing, so

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Generalized Double Pareto Priors for Regression

September 10, 2014
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Generalized Double Pareto Priors for Regression

This post is a review of the “GENERALIZED DOUBLE PARETO SHRINKAGE” Statistica Sinica (2012) paper by Armagan, Dunson and Lee. Consider the regression model (Y=Xbeta+varepsilon) where we put a generalized double pareto distribution as the prior on the regression coefficients (beta). The GDP distribution has density $$begin{equation} f(beta|xi,alpha)=frac{1}{2xi}left( 1+frac{|beta|}{alphaxi} right)^{-(alpha+1)}. label{} end{equation}$$ GDP as Scale The post

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Fun with Bordered Cubes

September 9, 2014
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Fun with Bordered Cubes

I am interested in generating 3D reasoning items in R. To this end I have adapted some of the awesome functions built in the rgl library to my ends. My new function is 'cube' and it takes position and automatically sizes itself as a 1x1x1 cube though t...

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Next Kölner R User Meeting: Friday, 12 September 2014

September 9, 2014
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Next Kölner R User Meeting: Friday, 12 September 2014

The next Cologne R user group meeting is scheduled for this Friday, 12 September 2014.We have a great agenda with international speakers: Maarten-Jan Kallen: Introduction to Renjin, the R interpreter for the JVM Jonathan Cornelissen, Martijn Theuwissen: DataCamp - An online interactive learning platform for R The event will be followed by drinks and schnitzel...

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ASDAR book Review

September 8, 2014
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ASDAR book Review

I was recently invited to write a book review for Applied Spatial Analysis and Policy (ASAP). The book, I conclude, “is the authoritative resource on R’s spatial capabilities” and should be of interest to many R users. Below is a preprint of the full review, now published on ASAP’s website. As a geographer and heavy R user,...

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Build a SPAM filter with R

September 8, 2014
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Build a SPAM filter with R

You can find the complete code on github: https://github.com/JulianHill/R-Tutorials/blob/master/spam_class_r.r   Introduction: The topic Machine Learning gets more and more important. The number of data sources grows everyday and it makes it hard to get... The post Build a SPAM filter with R appeared first on ThinkToStart.

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An exercise in non-linear modeling

September 7, 2014
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An exercise in non-linear modeling

In my previous post I wrote about the importance of age and why it is a good idea to try avoiding modeling it as a linear variable. In this post I will go through multiple options for (1) modeling non-linear effects in a linear regression setting, (2) benchmark the methods on a real dataset, and (3) look at how...

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1.2 Millions Deaths by Ebola projected within Six Months?

September 5, 2014
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1.2 Millions Deaths by Ebola projected within Six Months?

The World Health Organization, Samaratins Purse, Doctors Without Borders, and other international medical emergency relief programs are desperately calling for additional resources in the international fight against Ebola that has already killed thousa...

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