400 search results for "evaluation"

advanced.procD.lm for pairwise tests and model comparisons

June 9, 2015
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In geomorph 2.1.5, we decided to deprecate the functions, pairwiseD.test and pairwise.slope.test.   Our reason for this was two-fold.  First, recent updates by CRAN rendered these functions unstable.  These functions depended on the mode...

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analyze the trends in international mathematics and science study (timss) with r

June 9, 2015
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an underexplored chest of international quantitative aptitude testing, the trends in international mathematics and science study (timss) would make any pearson stockholder smile.  examining the mathematical mastery of more than 600,000 students fr...

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analyze the progress in international reading literacy study (pirls) with r

June 8, 2015
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an uncharted world of international reading comprehension information, the progress in international reading literacy study (pirls) would make any ets executive blush. testing the educational chops of more than 300,000 students from nearly fifty count...

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Why has R, despite quirks, been so successful?

June 8, 2015
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I was on a panel back in 2009 where Bow Cowgill said, "The best thing about R is that it was written by statisticians. The worst thing about R is that it was written by statisticians." R is undeniably quirky — especially to computer scientists — and yet it has attracted a huge following for a domain-specific language, with...

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My aversion to pipes

June 3, 2015
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At the risk of coming across as even more of a curmudgeonly old fart than people already think I am, I really do dislike the current vogue in R that is the pipe family of binary operators; e.g. %>%. Introduced by Hadley Wickham and popularised and advanced via the magrittr package by Stefan Milton Bache, the basic idea...

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Statistical Models with a Point of View: First vs. Third Person

June 2, 2015
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Statistical Models with a Point of View: First vs. Third Person

Marketing data can be collected in the first or third person, and we require different statistical models for each point of view.Netflix encourages you to adopt a third-person perspective when it surveys your taste preferences by asking how often you w...

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Roman dataviz and inference in complex systems

May 29, 2015
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Roman dataviz and inference in complex systems

I’m in Rome at the International Workshop on Computational Economics and Econometrics. I gave a seminar on Monday on the ever-popular subject of data visualization. Slides are here. In a few minutes, I’ll be speaking on Inference in Complex Systems, … Continue reading →

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Review of ‘Advanced R’ by Hadley Wickham

May 24, 2015
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Review of ‘Advanced R’ by Hadley Wickham

Executive summary Surprisingly good. And it’s not like my expectations were especially low. Structure There are 20 chapters.  I mostly like the chapters and their order. Hadley breaks the 20 chapters into 4 parts.  He’s wrong.  Figure 1 illustrates the correct way to formulate parts. Figure 1: Chapters and Parts of Advanced R.    Introductory R There The post

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streaming machine learning with RMOA: stream_in > train > predict

streaming machine learning with RMOA: stream_in > train > predict

We will be showcasing our RMOA package at the next R User conference in Aalborg. For the R users who are unfamiliar with streaming modelling and want to be ahead of the Gartner Hype cycle or want to evaluate existing streaming machine learning models, RMOA allows to build, run and evaluate streaming classification models which are built in

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Data Science in HR

May 5, 2015
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Data Science in HR

by Joseph Rickert Last year in a post on interesting R topics presented at the JSM I described how data scientists in Google's human resources department were using R and predictive analytics to better understand the characteristics of its workforce. Google may very well have done the pioneering work, but predictive analytics for HR applications is going mainstream. In...

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