400 search results for "evaluation"

Hockey Elbow and Other Response Time Injuries

July 29, 2015
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Hockey Elbow and Other Response Time Injuries

You've heard of tennis elbow. Well, there's a non-sports, performance injury that I like to call hockey elbow. An example of such an "injury" is shown in Figure 1, which appeared in a recent computer performance analysis presentation. It's a reminder of how easy it is to become complacent when doing performance analysis and possibly end up reaching...

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The complete catalog of argument variations of select() in dplyr

July 28, 2015
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When I read the dplyr vignette, I found a convenient way to select sequential columns such as select(data, year:day). Because I had inputted only column names to select() function, I was deeply affected by the convenient way. On closer inspection, I found that the select() function accepts many types of input. Here, I will enumerate the variety...

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Call for participation: AusDM 2015, Sydney, 8-9 August

July 23, 2015
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Call for participation: AusDM 2015, Sydney, 8-9 August

************************************************************* The 13th Australasian Data Mining Conference (AusDM 2015) Sydney, Australia, 8–9 August 2015 URL: http://ausdm15.ausdm.org/ ************************************************************* The Australasian Data Mining Conference is devoted to the art and science of intelligent data mining: the meaningful analysis of (usually large) data … Continue reading →

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A Tutorial on Loops in R – Usage and Alternatives

July 21, 2015
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A Tutorial on Loops in R – Usage and Alternatives

Introduction In this easy-to-follow R tutorial on loops we will examine the constructs available in R for looping, and how to make use of R’s vectorization feature to perform your looping tasks more efficiently. We will present a few looping examples; then criticize and deprecate these in favor of the most popular vectorized alternatives (amongst The post

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New package "SparkRext" – SparkR extension for closer to dplyr

July 11, 2015
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Apache Spark is one of the hottest products in data science.Spark 1.4.0 has formally adopted SparkR package which enables to handle Spark DataFrames on R.SparkR is very useful and powerful.One of the reasons is that SparkR DataFrames present an API sim...

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Stress testing

July 6, 2015
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Stress testing

Lately, we've been spending a lot of time "stress-testing" our method for the computation of the Expected Value of Partial Perfect Information (EVPPI $-$ I know: the terminology is a bit strange and possibly not-very helpful, as "perfect" information d...

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Review: Machine Learning with R Cookbook

July 3, 2015
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"Machine Learning with R Cookbook" by Chiu Yu-Wei is nothing more or less than it purports to be: a collection of 110 recipes for applying Data Analysis and Machine Learning techniques in R. I was asked by the publishers to review this book and found it to be an interesting and informative read. It will The post

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useR 2015: Romain Francois: My R adventures

July 1, 2015
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useR 2015: Romain Francois: My R adventures

Using R since 2002 and has been working on Rcpp, Rcpp11, Rcpp14 and dplyr internals. Worked on a number of big projects. 2005 he set up the R Graph Gallery 2009 worked on rJava 2010 Rcpp 2013 dplyr Key themes are Performance and usabililty rJava 0.7-* Creating objects was messy d <-jnew("java/lang/Double", 42 .jcal(d, "D",

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Modeling Interest Rates Meucci Style

June 24, 2015
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Modeling Interest Rates Meucci Style

I have signed up for Attilio Meucci’s ARPM Bootcamp next month (July 13-18) in NYC http://www.symmys.com/arpm-bootcamp, and need to do quite a bit of prep as it’s going to be a deep-dive…The Advanced Risk and Portfolio Management Bootcamp provides in-depth understanding of buy-side modeling from the foundations to the most advanced statistical and optimization techniques, in 6...

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Looking for Preference in All the Wrong Places: Neuroscience Suggests Choice Model Misspecification

June 22, 2015
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Looking for Preference in All the Wrong Places: Neuroscience Suggests Choice Model Misspecification

At its core, choice modeling is a utility estimating machine. Everything has a value reflected in the price that we are willing to pay in order to obtain it. Here are a collection of Smart Watches from a search of Google Shopping. You are free to click...

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