July 2013

How divided is the Senate?

July 29, 2013 | Vik Paruchuri

I very seldom pay attention to politics directly, because politics have always seemed a bit circular and cyclical to me. Most of the political news that I take in ends up worming its way into the news sources that I do consume, like the excellent longform.org. Even given my ... [Read more...]

Stop Loss

July 29, 2013 | systematicinvestor

Today I want to share and present an example of the flexible Stop Loss functionality that I added to the Systematic Investor Toolbox. Let’s examine a simple Moving Average Crossover strategy: Buy is triggered once fast moving average crosses above the slow moving average Sell is triggered once fast ... [Read more...]

Quandl.com for Time Series Datasets

July 29, 2013 | Cory Lesmeister

If you want to dig in with both feet on time series data, then quandl.com is a good choice.  The website claims to have several million datasets all of them available for free download.  It also allows you to upload data to the site with an a... [Read more...]

Tips for speeding up R with byte compilation

July 29, 2013 | David Smith

A byte-compiler for R code — which can improve the execution performance of R functions — was introduced in R 2.13.0, and was automatically applied to the bundled packages in R 2.14.0. Drew Dimmery provides some good advice for identifying targets amongst your own R functions for compilation: I have some function that will ... [Read more...]

Estimate Age from First Name

July 29, 2013 | inkhorn82

Today I read a cute post from Flowing Data on the most trendy names in US history. What caught my attention was a link posted in the article to the source data, which happens to be yearly lists of baby … Continue reading → [Read more...]

Programming instrumental music from scratch

July 29, 2013 | Vik Paruchuri

I recently posted about automatically making music. The algorithm that I made pulled out interesting sequences of music from existing songs and remixed them. While this worked reasonably well, it also didn’t have full control over the basics of the music; it wasn’t actually specifying which instruments to ... [Read more...]

Exploratory Data Analysis: Combining Histograms and Density Plots to Examine the Distribution of the Ozone Pollution Data from New York in R

July 29, 2013 | Eric Cai - The Chemical Statistician

Introduction This is a follow-up post to my recent introduction of histograms.  Previously, I presented the conceptual foundations of histograms and used a histogram to approximate the distribution of the “Ozone” data from the built-in data set “airquality” in R.  Today, I will examine this distribution in more detail by ... [Read more...]

Easier Database Querying with R

July 29, 2013 | RGuy

I have a strong distaste for database connection management.  All I want to do when I want to query one of our many databases at work is to simply supply the query, and package the result into an R data.frame or data.table. R has many great database connection ... [Read more...]

BCEA 2.0

July 28, 2013 | Gianluca Baio

I know that updating a package too often is not quite good practice, so, given we've released BCEA 1.3-1 just about a month ago, this is way too soon to move forward. But between the last release and now, I've been doing some reading and have made some... [Read more...]

Orthogonal Partial Least Squares (OPLS) in R

July 28, 2013 | dgrapov

I often need to analyze and model very wide data (variables ______samples), and because of this I gravitate to robust yet relatively simple methods. In my opinion partial least squares (PLS) is a particular useful algorithm. Simply put, PLS is an extension of principal components analysis (PCA), a non-supervised  method ... [Read more...]

Hopfield Networks in Julia

July 28, 2013 | John Myles White

As a fun side project last night, I decided to implement a basic package for working with Hopfield networks in Julia. Since I suspect many of the readers of this blog have never seen a Hopfield net before, let me explain what they are and what they can be used ... [Read more...]

SAP HANA OData and R

July 27, 2013 | Alvaro "Blag" Tejada Galindo

As you might have discovered by now...I love R...it's just an amazing programming language...By now...I have integrate R and SAP HANA via ODBC and via the SAP HANA-R integration...but I have completely left out the SAP HANA OData capabilities.For this ... [Read more...]

H*Wind Analyses Using R

July 27, 2013 | robhodge

I did a (relatively) simple work-up over on Github showing how to load in AOML/NOAA H*Wind analysis data and display it. I used the R program, which is an open-source, community-maintained statistical platform capable of handling – well – just about anything. So what is H*Wind? From AOML/NOAA: ... [Read more...]

The Secrets of Inverse Brogramming, reprise

July 27, 2013 | richierocks

Brogramming is the art of looking good while you write code. Inverse brogramming is a silly term that I’m trying to coin for the opposite, but more important, concept: the art of writing good looking code. At useR2013 I gave a talk on inverse brogramming in R – for those ... [Read more...]

Science link fest for the week of the 27th

July 27, 2013 | Ryan Brown

Hello Paleoposse! This week I bring you Egyptians and iron meteorites, Neil deGrasse Tyson as the Carl Sagan of our generation and a mild rant about poor quality science reporting. I’m off to enjoy my 30th birthday. Hope you all have an awesome weekend! Solid science: Here’s a ... [Read more...]
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