Monthly Archives: July 2012

What’s wrong with LOESS for palaeo data?

July 24, 2012
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What’s wrong with LOESS for palaeo data?

Locally weighted scatterplot smoothing (LOWESS) or local regression (LOESS) is widely used to highlight “signal” in variables from stratigraphic sequences. It is a user-friendly way of fitting a local model that derives its form from the data themselves rather than having to be specified a priori by the user. There are generally two things that a user has...

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RcppGSL 0.2.0

July 23, 2012
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Earlier today, a minor update / maintenance release of RcppGSL---our interface package between R and the GNU GSL using our Rcpp package for seamless R and C++ integration---arrived on on CRAN. It contains a number of minor changes to accomodate chan...

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Faster R in Hadoop: rmr 1.3 now available

July 23, 2012
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The RHadoop project continues the Big Data integration of R and Hadoop, with a new update to its rmr package. Version 1.3 of rmr improves the performance of map-reduce jobs for Hadoop written in R. New features include: An optional vectorized API for efficient R programming when dealing with small records. Fast C implementations for serialization and deserialization from...

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Deploy Rook Apps with rApache: Part I

July 23, 2012
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Since rApache 1.1.15 you’ve been able to deploy you Rook applications like so: # Run the Rook application named 'app'. On each request, the expression # 'Rook::Server$call(app)' is evaluated in an environment populated by # rookapp.R. 'app' is expected to be found in that environment. <Location /test/RookApp> SetHandler r-handler ...

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Success does not require understanding

July 23, 2012
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I took part in the second Data Science London Hackathon last weekend (also my second hackathon) and it was a very different experience compared to the first hackathon. Once again Carlos and his team really looked after us. The data was released 24 hours before the competition started and even though I had spent less

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How to write a rapport template

July 23, 2012
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How to write a rapport template

This post will show an introduction for the users how to produce a template, so how to produce similar results, like those one can see on rapport's homepage or in our forthcoming reporting web application.The post was written from the view of a Windows user, if problems were came up because you use...

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Estimating required hospital bed capacity

July 23, 2012
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Estimating required hospital bed capacity

Estimating required hospital bed capacity requires a thorough analysis. There are a lot of ways of approaching a capacity requirement problem, but I think we can agree that a simple spreadsheet analysis just won't cut it. The approach described in this post makes use of discrete-event simulation and, just to  Read...

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Music Data Hackathon 2012 – Beginner’s view

July 23, 2012
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Music Data Hackathon 2012 – Beginner’s view

When I first heard of the existence of Hackathons (receive a data set, predict the response as good as possible, win money. All within 24 hours), I had two thoughts:1. Wow, that sounds greats. Like a huge game for intelligent people.2. My skills are no...

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Modeling Trick: Impact Coding of Categorical Variables with Many Levels

July 23, 2012
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Modeling Trick: Impact Coding of Categorical Variables with Many Levels

One of the shortcomings of regression (both linear and logistic) is that it doesn’t handle categorical variables with a very large number of possible values (for example, postal codes). You can get around this, of course, by going to another modeling technique, such as Naive Bayes; however, you lose some of the advantages of regression Related posts:

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Computing the degree of dependency (jointness) among explanatory variables using BMS

July 23, 2012
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Capturing the dependence between explanatory variables in the posterior distribution while implementing a Bayesian analysis is crucial. Taking such a dependence into account reveals the sensitivity of posterior distributions of parameters to depen...

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