## DataScienceLA interviews David Smith

August 27, 2014
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While I was in LA for the useR! 2014 conference last month, I had the great pleasure of being among the participants in the DataScienceLA interview series hosted by Eduardo Ariño de la Rubia. Eduardo is both an R user and an excellent interviewer: his preparation and knowledge of R has resuled in a fascinating interview series for any...

## statebins – U.S. State Cartogram Heatmaps in R

August 27, 2014
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UPDATE The statebins package is now available on CRAN I became enamored (OK, obsessed) with a recent visualization by the WaPo team which @ryanpitts tweeted and dubbed statebins:

## R Workshops Updated to Include the Latest Packages

August 27, 2014
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Two new R packages are quickly becoming standards in the R community: Hadley Wickham’s dplyr and tidyr. The dplyr package almost completely replaces his popular plyr package for data...

August 27, 2014
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Original post from Robin's Blog:Software is very important in science – but good software takes time and effort that could be used to do...

August 26, 2014
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What is the Gauss-Markov theorem? From “The Cambridge Dictionary of Statistics” B. S. Everitt, 2nd Edition: A theorem that proves that if the error terms in a multiple regression...

## TTTAR2: My First Shiny App with Bootstrap – #RUGSMAPS

August 26, 2014
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Thing To Try After useR! part 2 (TTTAR2) Originally, this post was supposed to be a sequel to TTTAR1 about h2o machine learning. Since TTTAR1...

## Statistics: Losing Ground to CS, Losing Image Among Students

August 26, 2014
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by Norman Matloff The American Statistical Association (ASA) leadership, and many in Statistics academia. have been undergoing a period of angst the last few years, They worry that the...

## Coursera course on computational finance with R

August 26, 2014
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As of today (Tuesday 26th of August), a new session of Professor Eric Zivot’s course on computational finance and financial econometrics starts on Coursera. Just like the previous run of the...

August 26, 2014
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Original post from GitHub Guides:Digital Object Identifiers (DOI) are the backbone of the academic reference and metrics system. If you’re a researcher writing...

## Statistics: Losing Ground to CS, Losing Image Among Students

August 26, 2014
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The American Statistical Association (ASA)  leadership, and many in Statistics academia. have been undergoing a period of angst the last few years,  They worry that the field of Statistics...

August 26, 2014
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Over the weekend we released version 0.1.8 of the ChainLadder package for claims reserving on CRAN. What is claim reserving?The insurance industry, unlike other industries, does not sell...

## The Chi-Squared Test of Independence – An Example in Both R and SAS

$The Chi-Squared Test of Independence – An Example in Both R and SAS$

Introduction The chi-squared test of independence is one of the most basic and common hypothesis tests in the statistical analysis of categorical data.  Given 2 categorical random variables, and...

## Do Massive Workloads Equal Big Declines in Running Back Productivity?

August 25, 2014
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The popular wisdom is that “massive workloads” result in a decline in running back productivity in the following season. For example, anecdotal evidence using Corey Dillon (2004) and Jamaal...

## Continuous or Discrete Latent Structure? Correspondence Analysis vs. Nonnegative Matrix Factorization

August 25, 2014
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A map gives us the big picture, which is why mapping has become so important in marketing research. What is the perceptual structure underlying the European automotive market? All...

## Spline interpolation of temporal resolution for satellite images.

August 25, 2014
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This week, I had a discussion with a few of...

## David Smith, the useR! 2014 Interview

August 25, 2014
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“At one point, the only source for daily R news was David Smith’s blog.” —...

## Of Needles and Haystacks: Building an Accurate Statewide Dropout Early Warning System in Wisconsin

August 25, 2014
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For the past two years I have been working on the Wisconsin Dropout Early Warning System, a predictive model of on time high school graduation for students in grades...

## 8 new R jobs (for Augest 25th 2014)

August 25, 2014
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This is the bimonthly R Jobs post (for 2014-08-25), based on the R-bloggers’ sister website: R-users.com. If you are an employer who is looking to hire people from the R community, please visit this link...

## Some love for ggplot2

August 25, 2014
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With all the recent buzz about ggvis (this, this, and this) it’s often easy to forget all that ggplot2 offers as a graphics package. True, ggplot is a static...

## New in OpenCPU 1.4.4: session namespaces

August 24, 2014
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The OpenCPU system exposes an HTTP API for embedded scientific computing with R. This provides reliable and scalable foundations for integrating R based...

## Forecasting with R in WA

August 24, 2014
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On 23–25 September, I will be running a 3-day workshop in Perth on “Forecasting: principles and practice” mostly based on my book of the same name. Workshop participants will...

## R: Stem (Pre-Processed) Text Blocks

August 24, 2014
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Objective I recently needed to stem every word in a block of text i.e. reduce each word to a root form. Problem The stemmer I was using would only...

## JAGS and Stan

August 24, 2014
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During the last year I have been running some estimations in both JAGS and Stan. In that period I have seen one example where JAGS could not get me...

## Computational Actuarial Science, with R

August 24, 2014
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The book Computational Actuarial Science, with R is officially out. In the introduction of the book, and on the website of CRC, it is mentioned that the datasets can be...

## VCI — The Value Charts Indicator

August 23, 2014
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So recently, I was made known of the Value Charts Indicator , which was supposed to be some form of … Continue reading →

## R OOP – a little privacy please?

August 23, 2014
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As of late, I’ve been making heavy use of Reference Classes in R. They are easier for me to wrap my mind around since they adopt a usage...

## An adverse consequence of fitting "maximal" linear mixed models

August 23, 2014
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Distribution of intercept-slope correlation estimates with 37 subjects, 15 itemsDistribution of intercept-slope correlation estimates with 50 subjects, 30 itemsShould one always fit a full variance covariance matrix (a "maximal"...

## More ESA 2014 Program Text-Mining: Topics as Communities

August 22, 2014
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In my first pass at text analysis of the ESA program, I looked at how the frequency of words used in the ESA program differed from...