the Flatland paradox [#2]

May 26, 2015
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the Flatland paradox [#2]

Another trip in the métro today (to work with Pierre Jacob and Lawrence Murray in a Paris Anticafé!, as the University was closed) led me to infer—warning!, this is not the exact distribution!—the distribution of x, namely since a path x of length l(x) will corresponds to N draws if N-l(x) is an even integer

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Respecting Real-World Decision Making and Rejecting Models That Do Not: No MaxDiff or Best-Worst Scaling

May 26, 2015
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Respecting Real-World Decision Making and Rejecting Models That Do Not: No MaxDiff or Best-Worst Scaling

Utility has been reified, and we have committed the fallacy of misplaced concreteness.As this link illustrates, Sawtooth's MaxDiff provides an instructive example of reification in marketing research. What is the...

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New package on CRAN: lamW

May 26, 2015
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Recently, in various research projects, the Lambert-W function arose a number of times. Somewhat frustratingly, there is no built-in function in R to calculate it. The only options were...

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Situational Baseball: Analyzing Runs Potential Statistics

May 26, 2015
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By Mark Malter A few weeks ago, I wrote about my Baseball Stats R shiny application, where I demonstrated how to calculate runs expectancies based on the 24 possible...

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New Version of RStudio (v0.99) Available Now

May 26, 2015
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New Version of RStudio (v0.99) Available Now

We’re pleased to announce that the final version of RStudio v0.99 is available for download now. Highlights of the release include: A new data viewer with support for large datasets, filtering,...

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Communicating Risk at the Bay Area R User Group

May 26, 2015
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I will be speaking at the Bay Area User Group meeting tonight about Communicating Risk. Anthony Goldbloom from Kaggle and Karim Chine from ElasticR will be there as well....

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Searching for the Steamer retroelement in the ocean metagenome

May 25, 2015
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Searching for the Steamer retroelement in the ocean metagenome

Last week, I was listening to episode 337 of the podcast This Week in Virology. It concerned a retrovirus-like sequence element named Steamer, which is associated with a transmissible...

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R and Data Mining workshop at Deakin University

May 25, 2015
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R and Data Mining workshop at Deakin University

I will run a workshop on R and Data Mining for students in the Master of Business Analytics course at Deakin University in Melbourne on Thursday 28 May. The...

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Granger Causality Test

May 25, 2015
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Granger Causality Test

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Open data sets you can use with R

May 25, 2015
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R is an environment for programming with data, so unless you're doing a simulation study you'll need some data to work with. If you don't have data of your...

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Interactive maps of Crime data in Greater London

May 25, 2015
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Interactive maps of Crime data in Greater London

In the previous post we looked at ways to perform some introductory point pattern analysis of open data downloaded from Police.uk. As you remember we subset the dataset of...

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Paper Helicopter experiment, part II

May 25, 2015
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Paper Helicopter experiment, part II

Last week I created a JAGS model combining data from two paper helicopter datasets. This week, I will use the model to find the longest flying one.PredictingThe JAGS/RJAGS system...

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Geomorph update 2.1.5 Now Available!

May 24, 2015
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Geomorph update 2.1.5 Now Available!

Geomorph users,We have uploaded version 2.1.5 of geomorph* to CRAN. The windows and mac binaries have been compiled and the tarball is available.New Features:New Auto Mode allows users to include pre-digitized landmarks...

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another viral math puzzle

May 24, 2015
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another viral math puzzle

After the Singapore Maths Olympiad birthday problem that went viral, here is a Vietnamese primary school puzzle that made the frontline in The Guardian. The question is: Fill the...

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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...

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My favorite R bug

May 23, 2015
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My favorite R bug

In this note am going to recount “my favorite R bug.” It isn’t a bug in R. It is a bug in some code I wrote in R. I...

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Parametric Inference: Likelihood Ratio Test Problem 2

May 23, 2015
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Parametric Inference: Likelihood Ratio Test Problem 2

More on Likelihood Ratio Test, the following problem is originally from Casella and Berger (2001), exercise 8.12.ProblemFor samples of size $n=1,4,16,64,100$ from a normal population with mean $mu$...

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My New Book and Other Matters

May 22, 2015
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My New Book and Other Matters

I haven’t posted for a while, so here are some news items: My new book, Parallel Computation for Data Science, will be out in June or July. I believe...

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Simulation-based power analysis using proportional odds logistic regression

May 22, 2015
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Simulation-based power analysis using proportional odds logistic regression

Consider planning a clinicial trial where patients are randomized in permuted blocks of size four to either a 'control' or 'treatment' group. The outcome is measured on an 11-point...

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visNetwork, Currencies, and Minimum Spanning Trees

May 22, 2015
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Just because I’m ignorant doesn’t mean I won’t try things.  Feel free to correct any ignorance that follows.  More than anything I would like to feature the new htmlwidget...

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R Now Contains 150 Times as Many Commands as SAS

May 22, 2015
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R Now Contains 150 Times as Many Commands as SAS

by Bob Muenchen In my ongoing quest to analyze the world of analytics, I’ve updated the Growth in Capability section of The Popularity of Data Analysis Software. To save...

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Old is New: XML and rvest

May 22, 2015
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Huh… I didn’t realize just how similar rvest was to XML until I did a bit of digging. After my wonderful experience using dplyr and tidyr...

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Tutorial Recap: Analyzing Census Data in R

May 22, 2015
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Tutorial Recap: Analyzing Census Data in R

A big thanks to Gabriela de Quieroz for organizing the San Francisco R-ladies Meetup, where I spent a few hours yesterday introducing people to my census-related R packages. A special thanks to Sharethrough...

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CONCOR in R

May 22, 2015
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CONCOR in R

In network analysis, blockmodels provide a simplified representation of a more complex relational structure. The basic idea is to assign each actor to a position and then depict the...

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sjmisc – package for working with (labelled) data #rstats

May 22, 2015
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sjmisc – package for working with (labelled) data #rstats

The sjmisc-package My last posting was about reading and writing data between R and other statistical packages like SPSS, Stata or SAS. After that, I decided to bundle all...

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Revolution R Open 3.2.0 now available for download

May 22, 2015
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The latest update to Revolution R Open, RRO 3.2.0, is now available for download from MRAN. In addition to new features, this release tracks the version number of the...

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The R Foundation announces new mailing list ‘R-package-devel’

May 22, 2015
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At last week’s monthly meeting, the R foundation has decided to create a new mailing list in order to help R package authors in their package development and testing....

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Exact computation of sums and means

May 21, 2015
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Exact computation of sums and means

A while ago, I came across a mention of the Python math.fsum function, which sums a set of floating-point values exactly, then rounds to the closest floating point value. This...

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BH release 1.58.0-1

A new released of BH is now on CRAN. BH provides a large part of the Boost C++ libraries as a set of template headers for use by...

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