Monthly Archives: April 2012

Drawdown Look at Frontier of Assets and Systems

April 23, 2012
By
Drawdown Look at Frontier of Assets and Systems

In Efficient Frontier of Funds and Allocation Systems, I had hoped to start exploring how a frontier can potentially be created with only one asset, or how an even more efficient frontier could be created with assets and also systems on those assets.&n...

Read more »

Short R script to plot effect sizes (Cohen’s d) and shade overlapping area

April 23, 2012
By
Short R script to plot effect sizes (Cohen’s d) and shade overlapping area

In this short post I take a look at how to use R and ggplot2 to visualize effect sizes (Cohen’s d) and how to shade the overlapping area of two distributions.

Read more »

Drop-Down Menus for R

April 23, 2012
By

A few days ago, Andrew Barr had a great post on his blog. It was titled, "R is not just for nerds....it has drop-down menus!" You can bet that this one caught my eye when it was re-posted on R-Bloggers.Briefly, Andrew takes us through the installation and basic use of the Java Gui for R (JGR) in...

Read more »

Introduction to Oracle R Connector for Hadoop

April 23, 2012
By

MapReduce, the heart of Hadoop, is a programming framework that enables massive scalability across servers using data stored in the Hadoop Distributed File System (HDFS). The Oracle R Connector for Hadoop (ORCH) provides access to a Hadoop cluster from R, enabling manipulation of HDFS-resident data and the execution of MapReduce jobs. Conceptutally, MapReduce is similar...

Read more »

Talk on quantiles at the R Montreal group

April 23, 2012
By
Talk on quantiles at the R Montreal group

This afternoon, I will be giving a two-hour talk at McGill on quantiles, quantile regressions, confidence regions, bagplots and outliers. Before defining (properly) quantile regressions, we will mention regression on (local) quantiles, as on the gr...

Read more »

Puzzle: A path through pairs making squares

April 23, 2012
By
Puzzle: A path through pairs making squares

Ted Harding posed an interesting puzzle challenge on the r-help mailing list recently. Here's the puzzle: Take the numbers 1, 2, 3, etc. up to 17. Can you write out all seventeen numbers in a line so that every pair of numbers that are next to each other, adds up to give a square number? You can figure out...

Read more »

Tuning GAMBoost

April 23, 2012
By
Tuning GAMBoost

This post describes some of the simulation results which I obtained with the GAMBoost package. The aim of these simulations is to get a feel what I should tune and what I should not tune with GAMBoost. SetupIn the GAMBoost package one can tune qui...

Read more »

Example 9.28: creating datasets from tables

April 23, 2012
By
Example 9.28: creating datasets from tables

RThere are often times when it is useful to create an individual level dataset from aggregated data (such as a table). While this can be done using the expand.table() function within the epitools package, it is also straightforward to do directly within R.Imagine that instead of the individual level data, we had only the 2x2 table for the...

Read more »

Quantitative palaeolimnology: my book chapters are finally out!

April 23, 2012
By
Quantitative palaeolimnology: my book chapters are finally out!

Today I received confirmation that the delayed fifth volume in the Developments in Palaeoenvironmental Research series has been published. The book is titled Data Handling and Numerical methods, though it covers more of the latter and, IMHO, is far more interesting than … Continue reading →

Read more »

Updates to the Emacs Starter Kit for the Social Sciences

April 23, 2012
By

I've made some updates to the Emacs Starter Kit for the Social Sciences. The kit builds on Phil Hagelberg's original and Eric Schulte's org-mode version, and incorporates some packages and settings that are particularly useful for the social sciences. ...

Read more »