February 2014

Using CART for Stock Market Forecasting

February 28, 2014 | The R Trader

There is an enormous body of literature both academic and empirical about market forecasting. Most of the time it mixes two market features: Magnitude and Direction. In this article I want to focus on identifying the market direction only. The goal I set myself, is to identify market conditions when ... [Read more...]

Simply creating various scatter plots with ggplot #rstats

February 28, 2014 | Daniel

Inspired by these two postings, I thought about including a function in my package for simply creating scatter plots. In my package, there’s a function called sjp.scatter for creating scatter plots. To reproduce these examples, first load the package and then attach the sample data set: The simplest ... [Read more...]

A minor update to my “apply functions” post

February 27, 2014 | nsaunders

One of my more popular posts is A brief introduction to “apply” in R. Come August, it will be four years old. Technology moves on, old blog posts do not. So: thanks to BioStar user zx8754 for pointing me to this Stack Overflow post, in which someone complains that the ... [Read more...]

Foundations of Statistical Algorithms [book review]

February 27, 2014 | xi'an

There is computational statistics and there is statistical computing. And then there is statistical algorithmic. Not the same thing, by far. This 2014 book by Weihs, Mersman and Ligges, from TU Dortmund, the later being also a member of the R Core team, stands at one end of this wide spectrum ... [Read more...]

R User Groups Update

February 27, 2014 | Joseph Rickert

by Joseph Rickert After an end-of-year slow down in R user group acrtivity that lasted into mid January, the Revolution Analytics’ Community Calendar indicates that R user groups worldwide are back in full swing with 48 events listed in the short month of February. And, while the total number of active ... [Read more...]

The tf-idf-Statistic For Keyword Extraction

February 27, 2014 | Raffael Vogler

The tf-idf-statistic (“term frequency – inverse document frequency”) is a common tool for the purpose of extracting keywords from a document by not just considering a single document but all documents from the corpus. In terms of tf-idf a word … Continue reading → The post The tf-idf-Statistic For Keyword Extraction appeared first ... [Read more...]

More time series data online

February 27, 2014 | Rob J Hyndman

Earlier this week I had coffee with Ben Fulcher who told me about his online collection comprising about 30,000 time series, mostly medical series such as ECG measurements, meteorological series, birdsong, etc. There are some finance series, but not ma... [Read more...]

Vertical Histogram

February 26, 2014 | ezpz

In the process of munging data for my current project I came across the need to compare (visually) the difference between two modes within the same dataset. I was using a simple scatterplot and setting the alpha in the hopes that the over-plotting woul... [Read more...]

Revolution Analytics named a Visionary in the Gartner Magic Quadrant for Advanced Analytics Platforms

February 26, 2014 | David Smith

The entire team at Revolution Analytics is very proud to announce that Gartner has named Revolution Analytics a Visionary in the inaugural Gartner Magic Quadrant for Advanced Analytics Platforms, published February 19, 2014. The report evaluated 16 vendors through a series of stringent criteria related to the ability to execute and completeness of ... [Read more...]

Announcing Shiny Server Pro general availability

February 26, 2014 | rwo2014

We are excited to announce the general availability of RStudio Shiny Server Pro. Shiny Server Pro is the simplest way for data scientists and R users in the enterprise to share their work with colleagues. With Shiny Server Pro you can: Secure access to Shiny applications with authentication systems such ... [Read more...]
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