# Monthly Archives: March 2014

## Filtering Data with L1 Regularisation

March 27, 2014
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$Filtering Data with L1 Regularisation$

A few days ago I posted about Filtering Data with L2 Regularisation. Today I am going to explore the other filtering technique described in the paper by Tung-Lam Dao. This is similar to the filter discussed in my previous post, but uses a slightly different objective function: where the regularisation term now employs the L1

## sjPlot 1.3 available #rstats #sjPlot

March 27, 2014
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I just submitted my package update (version 1.3) to CRAN. The download is already available (currently source, binaries follow). While the last two updates included new functions for table outputs (see here and here for details on these functions), the current update only provides small helper functions as new functions. The focus of this update

## Evolution of Code

March 27, 2014
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Recently while scraping some data from the college football data warehouse site, I started to realize the evolution of my code. To preface this, I am definitely not a trained programmer, just a self taught junky who enjoys doing it when I have time. ...

## Seasonal Unit Roots

March 26, 2014
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As discussed in the MAT8181 course, there are – at least – two kinds of non-stationary time series: those with a trend, and those with a unit-root (they will be called integrated). Unit root tests cannot be used to assess whether a time series is stationary, or not. They can only detect integrated time series. And the same holds...

## Visualising Pandas DataFrames With IPythonBlocks – Proof of Concept

March 26, 2014
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A few weeks ago I came across IPythonBlocks, a Python library developed to support the teaching of Python programming. The library provides an HTML grid that can be manipulated using simple programming constructs, presenting the outcome of the operations in a visually meaningful way. As part of a new third level OU course we’re putting

## Give your R charts that Wes Anderson style

March 26, 2014
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I'm a big fan of Wes Anderson's movies. I love the quirky characters and stories, the distinctive cinematography, and the unique visual style. Now you can bring some of that style to your own R charts, by making use of these Wes Anderson inspired palettes. Just choose your favourite Wes Anderson film or short: Install the wesanderson pallettes package,...

## Using R: quickly calculating summary statistics (with dplyr)

March 26, 2014
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I know I’m on about Hadley Wickham‘s packages a lot. I’m not the president of his fanclub, but if there is one I’d certainly like to be a member. dplyr is going to be a new and improved ddply: a package that applies functions to, and does other things to, data frames. It is also

## MCMC for Econometrics Students – Part IV

March 26, 2014
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This is the fourth in a sequence of posts designed to introduce econometrics students to the use of Markov Chain Monte Carlo (MCMC, or MC2) simulation methods for Bayesian inference. The first three posts can be found here, here, and here, and I'll assume that you've read them already. The emphasis throughout is on the...

## CpG Island shelves

March 26, 2014
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Nowadays, regions with relatively lower CpG density are gaining importance in DNA methylation studies. This is based on the fact that a majority of CpG rich regions (CpG islands) are non-dynamic and less variant in terms of methylation status probed ac...