September 2015

Kasseler useR Group: Data Science and Networking

September 23, 2015 | eoda GmbH

From October, the Kasseler useR Group meeting will be held on the second Wednesday of each month at 6.30 pm. The events will take place at Science Park Kassel. The Kasseler useR Group supports active exchange of information between R users. Discussions about experiences with R and news of R are ... [Read more...]

Fitting a neural network in R; neuralnet package

September 23, 2015 | Michy Alice

Neural networks have always been one of the most fascinating machine learning model in my opinion, not only because of the fancy backpropagation algorithm, but also because of their complexity (think of deep learning with many hidden layers) and structure inspired by the brain. Neural networks have not always been ... [Read more...]

Plotting 2

September 22, 2015 | wszafranski

In this post we’ll cover go into more detail on plotting commands. We’ll use a scatterplot (X-Y plot) as our example plot. Again we’ll use the command plot. ##First let's make some data x
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More on the Heteroscedasticity Issue

September 22, 2015 | matloff

In my last post, I dsciussed R software, including mine, that handles heteroscedastic settings for linear and nonlinear regression models. Several readers had interesting comments and questions, which I will address here. To review: Though most books and software assume homoscedasticity, i.e. constancy of the variance of the response ... [Read more...]

VW Big Data Play

September 22, 2015 | Gregory Kanevsky

Volkswagen made headlines lately for cheating U.S. EPA regulators. But let's pay some respect to their engineers.Apparently, there is no button or switch that tells car it's being tested - indeed - that would be obvious flaw in the emission test protoc... [Read more...]

Version 0.9.0 of eeptools released!

September 22, 2015 | Jared Knowles

A long overdue overhaul of my eeptools package for R was released to CRAN today and should be showing up in the mirrors soon. The release notes for this version are extensive as this represents a modernization of the package infrastructure and the reim... [Read more...]

How do you know if your model is going to work?

September 22, 2015 | Nina Zumel

Authors: John Mount (more articles) and Nina Zumel (more articles). Our four part article series collected into one piece. Part 1: The problem Part 2: In-training set measures Part 3: Out of sample procedures Part 4: Cross-validation techniques “Essentially, all models are wrong, but some are useful.” George Box Here’s a caricature of ...
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Drug Interaction Studies – Statistical Analysis

September 22, 2015 | jyothi

This post is actually a continuation of the previous post, and is motivated by this article that discusses the graphics and statistical analysis for a two treatment, two period, two sequence (2x2x2) crossover drug interaction study of a new treatment versus the standard. Whereas the previous post was devoted ...
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Upcoming talks in California

September 22, 2015 | R on Rob J Hyndman

I’m back in California for the next couple of weeks, and will give the following talk at Stanford and UC-Davis. Optimal forecast reconciliation for big time series data Time series can often be naturally disaggregated in a hierarchical or grouped structure. For example, a manufacturing company can disaggregate total ... [Read more...]

Upcoming talks in California

September 22, 2015 | Rob J Hyndman

I’m back in California for the next couple of weeks, and will give the following talk at Stanford and UC-Davis. Optimal forecast reconciliation for big time series data Time series can often be naturally disaggregated in a hierarchical or grouped structure. For example, a manufacturing company can disaggregate total ... [Read more...]

EARL London 2015: Our Highlights

September 21, 2015 | Hannah Evans

    We were overwhelmed by the positive comments from attendees at last week’s EARL conference in London. We are in the process of collecting survey responses from all delegates, but in the meantime a quick straw poll at Mango … Continue reading → [Read more...]

Applications of R at EARL 2015

September 21, 2015 | David Smith

The Effective Applications of R (EARL) Conference (held last week in London) is well-named. At the event I saw many examples of R being used to solve real-world industry problems with advanced statistics and data visualization. Here are just a few examples: AstraZeneca, the pharmaceutical company, uses R to design ... [Read more...]
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