Multilevel marketing as a way of liquidating participants’ social networks

December 11, 2013
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Multilevel marketing as a way of liquidating participants’ social networks

Here I’m using the term “liquidate” in the economics sense (conversion of an asset into cash) rather than the Rocky-and-Bullwinkle sense of the word. Here’s the story: Katherine Chen writes: An executive summary version of Ackman and Dineen’s Powerpoint analysis underscores the potential impact of DSOs [direct selling organizations] upon distributors’ networks: Recruiting family members, […]The post Multilevel marketing as a way of liquidating participants’ social networks appeared first on…

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Learn R and/or Data Management from Home January or April

December 11, 2013
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Learn R and/or Data Management from Home January or April

If you want to learn R, or improve your current R skills, join me for two workshops that I’m offering through Revolution Analytics in January and April. If you already know another analytics package, the workshop, Intro to R for … Continue reading →

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Why is Math boring, or why should no pain bring any gain

December 11, 2013
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The New York Times published a decent editorial asking a good question: Who says math has to be boring? Among the dire statistics, we hear "Only 18 percent of American adults can calculate how much a carpet will cost if they know the size of the room and the per square yard price of the carpet." And "The number of students who want to pursue engineering or computer science jobs…

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Visualize a matrix in SAS by using a discrete heat map

December 11, 2013
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Visualize a matrix in SAS by using a discrete heat map

A heat map is a graphical representation of a matrix that uses colors to represent values in the matrix cells. Heat maps often reveal the structure of a matrix. There are three common applications of visualizing matrices with heat maps: Visualizing a correlation or covariance matrix reveals relationships between variables. [...]

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A Lack of Communication and Visibility

December 11, 2013
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Finding visualization projects and pretty pictures on the web isn’t exactly difficult, but what about actual research? What if you wanted to know what’s going on in visualization, and get a sense of what current work is the most interesting? There is no resource for this that I’m aware of, but there should be. I’m […]

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Feature Prioritization: Multiple Correspondence Analysis Reveals Underlying Structure

December 10, 2013
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Feature Prioritization:  Multiple Correspondence Analysis Reveals Underlying Structure

Measuring the Power of Product Features to Generate Increased DemandProduct management requires more from feature prioritization than a rank ordering. It is simply not enough to know the "best" feature if that best does not generate increased demand. W...

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The use of registers in the context of EU–SILC – Eurostat

December 10, 2013
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The use of registers in the context of EU–SILC – Eurostat

From: http://epp.eurostat.ec.europa.eu/cache/ITY_OFFPUB/KS-TC-13-004/EN/KS-TC-13-004-EN.PDFThe European Union Statistics on Income and Living Conditions (EU-SILC) instrument is the main data source on income, poverty, social exclusion and living condit...

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Cross-validation and Bayesian estimation of tuning parameters

December 10, 2013
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Cross-validation and Bayesian estimation of tuning parameters

Ilya Lipkovich writes: I read with great interest your 2008 paper [with Aleks Jakulin, Grazia Pittau, and Yu-Sung Su] on weakly informative priors for logistic regression and also followed an interesting discussion on your blog. This discussion was within Bayesian community in relation to the validity of priors. However i would like to approach it […]The post Cross-validation and Bayesian estimation of tuning parameters appeared first on Statistical Modeling, Causal…

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Next Kölner R User Meeting: 13 December 2013

December 10, 2013
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Next Kölner R User Meeting: 13 December 2013

Quick reminder: The next Cologne R user group meeting is scheduled for this Friday, 13 December 2013. We are delighted to welcome:Matt Dowle and Arun Srinivasan: Introduction to data.tableThomas Rahlf: Book presentation - Datendesign mit RFurther deta...

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Book Review: Learning Geospatial Analysis with Python by Joel Lawhead

December 10, 2013
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Book Review: Learning Geospatial Analysis with Python by Joel Lawhead

I decided to read this book since I've been doing maps using R. Hence it is better to learn the literature and science behind mapping and how to do a proper analysis on it. In addition, I would like to see what Python can offer in this discipline.The b...

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eeptools 0.3 Released!

December 10, 2013
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Version 0.3 of my R package of miscellaneous code has been released, this time with substantial contributions from Jason Becker via GitHub. Progress continues toward the ultimate goal for eeptools to "make it easier for administrators at stat...

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To Cluster or Not to Cluster – That is the Question

December 10, 2013
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Several very prominent econometricians have fallen on either side of thisquestion, typically they are concerned that the number of clusters issmall and the size in each cluster is large.  One camp argues that theonly reasonable way of deriving con...

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Harvard gives new meaning to meritocracy

December 10, 2013
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Due to the fastidious efforts of Professor Harvey Mansfield, Harvard has confirmed the legend that "the hard part is to get in". Not only does it appear impossible to flunk out but according to the new revelation (link), the median grade given is A- and "the most frequently awarded grade at Harvard College is actually a straight A". The last sentence can be interpreted in two ways. If "straight A"…

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Biostar Tutorial: Cheat sheet for one-based vs zero-based coordinate systems

December 9, 2013
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Biostar Tutorial: Cheat sheet for one-based vs zero-based coordinate systems

Obi Griffith over at Biostar put together this excellent cheat sheet for dealing with one-based and zero-based genomic coordinate systems. The cheat sheet visually explains the difference between zero and one-based coordinate systems, as well as how to...

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How to model distributions that have outliers in one direction

December 9, 2013
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Shravan writes: I have a problem very similar to the one presented chapter 6 of BDA, the speed of light example. You use the distribution of the minimum scores from the posterior predictive distribution, show that it’s not realistic given the data, and suggest that an asymmetric contaminated normal distribution or a symmetric long-tailed distribution […]The post How to model distributions that have outliers in one direction appeared first on…

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The importance of a proper scale

December 9, 2013
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The importance of a proper scale

Business Insider (link) highlighted a map showing childhood food insecurity across the 50 states, with the data coming from a report by Brookings. This is a nice map. I like the tones of the chosen colors although the colors are...

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Last (talk before) Christmas

December 9, 2013
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Last (talk before) Christmas

OK, so first things first. I've always: 1) been a huge fan of the reindeer hat; 2) wondered what George Michael had actually given as a present to the other guy (if anything!). On a much less serious note, as I managed to get (nearly com...

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Comparing Predictive Accuracy, Twenty Years Later

December 9, 2013
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I have now posted the final pre-meeting draft of the "Use and Abuse" paper (well, more-or-less "final").I'll present it as the JBES Lecture, January 2014 ASSA meetings, Philadelphia. Please join if you're around. It's Friday January 3, 2:30, ...

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Interpreting PROC IML error messages: Matrices do not conform to the operation

December 9, 2013
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Interpreting PROC IML error messages: Matrices do not conform to the operation

When learning a new language, it is important to learn to interpret error messages that come from the language's parser or compiler. Three years ago I blogged about how to interpret SAS/IML error messages. However, many questions have been posted to the SAS/IML Support Community that indicate that some people [...]

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Visualizing data analysis pipelines using NetworkX

December 8, 2013
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Visualizing data analysis pipelines using NetworkX

In complicated data analysis pipelines and scientific workflows, it's often difficult to keep track of which tasks have to be performed before others. Even with informal forms of documentation (my personal favorite is 'notes.txt'), as the size of a project grows, and more dependencies are introduced, a formal documentation process has to be put in »more

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Update on Bayes Pharma 2014

December 8, 2013
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Update on Bayes Pharma 2014

This is the logo for the 2014 edition of Bayes Pharma. Very soon we'll advertise the programme and more details $-$ I'll post about it as well. At the moment, we're finalising the plan but I think we've decided to structure the workshops in this w...

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Sentence Drawing: Function vs. Art

December 8, 2013
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Sentence Drawing: Function vs. Art

I recently was reading the book “Functional Art” and came across the work of Stefanie Posavec. Her Sentence Drawings (click here to see and click here to learn) caught my attention. Here is a ggplot2 rendition: From what I understand … Continue reading →

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The never-ending (and often productive) race between theory and practice

December 8, 2013
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The never-ending (and often productive) race between theory and practice

Commenter Wonks Anonymous writes: After the recent EconNobel announcement I decided to check Dimensional’s Fama-French blog to see if it had much new content recently, and while it was dissapointingly sparse it did have an interesting bit where Fama linked to the best advice he’d ever gotten, from his statistics professor Harry Roberts: With formal […]The post The never-ending (and often productive) race between theory and practice appeared first on…

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