September 2015

How to Create Infographics in R

September 20, 2015 | n.ashutosh

Although you will learn in this article how to create inforgraphics in R, I will be honest: I don’t like meaningless, busy, and unactionable infographics. Then why did I write this article? A couple of reasons: I love the message of this chart I wanted to see what’s ... [Read more...]

Working With SEM Keywords in R

September 20, 2015 | atmathew

The following post is taken from two previous posts from an older blog of mine that is no longer available. These are from several years ago, and related to two critical questions that I encountered. One, how can I automatically generate hundreds of thousands of keywords for a search engine ... [Read more...]

RcppArmadillo 0.5.600.2.0

September 20, 2015 | Thinking inside the box

And yet another upstream Armadillo update -- version 5.600.2 was released yesterday by Conrad. So I pushed a new and matching RcppArmadillo release 0.5.600.2.0 to CRAN and to Debian. Armadillo is a powerful and expressive C++ template library for linear algebra aiming towards a good balance between speed and ease of use ... [Read more...]

RQuantLib 0.4.1

September 20, 2015 | Thinking inside the box

Right before heading off to last week's excellent EARL 2015 conference in London, a new minor release of RQuantLib was released onto CRAN and into Debian. The changes are detailed below. Changes in RQuantLib version 0.4.1 (2015-09-11) Changes... [Read more...]

Using the ggplot2 library in R

September 20, 2015 | Teja Kodali

In this article, I will show you how to use the ggplot2 plotting library in R. It was written by Hadley Wickham. If you don’t have already have it, install it and load it up: install.packages('ggplot2') library(ggplot2) qplot qplot is the quickest way to get ... [Read more...]

Teaching R to 200 students in a week

September 19, 2015 | Michael Levy - Rstats

I just taught a week-long “R Bootcamp” to 200 R newbies. It went quite well, and I thought it would be valuable to jot down some thoughts on what worked and what I might change if doing it again. The course design and my approach to teaching scientific computing in general ... [Read more...]

When is a Backtest Too Good to be True? Part Two.

September 19, 2015 | quintuitive

In the previous post, I went through a simple exercise which, to me, clearly demonsrtates that 60% out of sample guess rate (on daily basis) for S&P 500 will generate ridiculous returns. From the feedback I got, it seemed that my example was somewhat unconvincing. Let’s dig a bit further ... [Read more...]

#Altmetrics on CiteULike entries in R

September 19, 2015 | Egon Willighagen

I wanted to know when a set of publications I was aggregating on CiteULike was published. The number of publications per year, for example. I did a quick Google but could not find an R package to client to the CiteULike API, and because I wanted to play with JSON ... [Read more...]

#Altmetrics on CiteULike entries in R

September 19, 2015 | Egon Willighagen

I wanted to know when a set of publications I was aggregating on CiteULike was published. The number of publications per year, for example. I did a quick Google but could not find an R package to client to the CiteULike API, and because I wanted to pla... [Read more...]

Passing arguments to an R script from command lines

September 19, 2015 | Nathalie

This post describes how to pass external arguments to R when calling a Rscript with a command line. The case study presented here is very simple: a Rscript is called which needs, as an input, a file name (a text file containing data which are loaded into R to be ... [Read more...]

Predicting Titanic deaths on Kaggle VI: Stan

September 19, 2015 | Wingfeet

It is a bit a contradiction. Kaggle provides competitions on data science, while Stan is clearly part of the (Bayesian) statistics. Yet after using random forests, boosting and bagging, I also think this problem has a suitable size for Stan, which I understand can handle larger problems than older Bayesian ... [Read more...]

Predicting Titanic deaths on Kaggle VI: Stan

September 19, 2015 | Wingfeet

It is a bit a contradiction. Kaggle provides competitions on data science, while Stan is clearly part of the (Bayesian) statistics. Yet after using random forests, boosting and bagging, I also think this problem has a suitable size for Stan, which I un... [Read more...]

Can You Say “Heteroscedasticity” 3 Times Fast?

September 18, 2015 | matloff

Most books on regression analysis assume homoscedasticity, the situation in which Var(Y | X = t), for a response variable Y and vector of predictor variables X, is the same for all t. Yet, needless to say, almost all data in real life is heteroscedastic. For Y = human weight and X = ... [Read more...]
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