If I were at #ENAR2013 today, here’s where I’d go

March 12, 2013
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This week is the annual ENAR meeting, the big biostatistics conference, in Orlando, Florida. It actually started on Sunday but I haven’t gotten around to looking at the program (obviously, I’m not there right now). Flipping through the program now, … Continue reading →

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How to use optim in R

March 12, 2013
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How to use optim in R

A friend of mine asked me the other day how she could use the function optim in R to fit data. Of course there are functions for fitting data in R and I wrote about this earlier. However, she wanted to understand how to do this from scratch using opti...

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Man versus man-plus-machine

March 12, 2013
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As you read Steve Lohr's article "Algorithms Get a Human Hand in Steering Web" (link), recall what I wrote when discussing David Brooks's piece on Big Data (link): The biggest issue with Brooks's column is the incessant use of the flawed man versus machine dichotomy. He warns: "It's foolish to swap the amazing machine in your skull for the crude machine on your desk." The machine he has in his…

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S. Stanley Young: Scientific Integrity and Transparency

March 12, 2013
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S. Stanley Young: Scientific Integrity and Transparency

Stanley Young recently shared his summary testimony with me, and has agreed to my posting it.  S. Stanley Young, PhD Assistant Director for Bioinformatics National Institute of Statistical Sciences Research Triangle Park, NC One-page Summary Young Testimony of Committee on Science, Space and Technology, 5 March 2013 Scientific Integrity and Transparency S. Stanley Young, PhD, […]

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My problem with the Lindley paradox

March 12, 2013
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From a couple years ago but still relevant, I think: To me, the Lindley paradox falls apart because of its noninformative prior distribution on the parameter of interest. If you really think there’s a high probability the parameter is nearly exactly zero, I don’t see the point of the model saying that you have no [...]

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Examen intra, régression logistique et de Poisson

March 12, 2013
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Examen intra, régression logistique et de Poisson

L’examen intra du cours ACT2040 aura lieu mercredi matin, de 9:00 à 12:00. Aucun document autorisé, sauf les calculatrices (modèle standard, cf plan de cours), et les téléphones seront formellement interdits. Il y aura 34 questions portant sur la première partie du cours (jusqu’à la fin des modèles de comptage, sections 1 à 5 des transparents). 15 questions porteront sur la base décrite dans un précédant billet, sur le nombre…

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Simulating Random Multivariate Correlated Data (Categorical Variables)

March 12, 2013
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Simulating Random Multivariate Correlated Data (Categorical Variables)

This is a repost of the second part of an example that I posted last year but at the time I only had the PDF document (written in ). This is the second example to generate multivariate random associated data. This example shows how to generate ordinal, categorical, data. It is a little more complex than generating continuous [...]

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Attention Radar: How Political Trends Develop over Time

March 11, 2013
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Attention Radar: How Political Trends Develop over Time

Attention Radar [minddesign.info], designed by Mind Design, is a web app, specifically designed to be viewed on the iPad, that visualizes the changes in political agendas of the Netherlands over time. The interactive, stacked area chart contrasts dif...

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Simulating Random Multivariate Correlated Data (Continuous Variables)

March 11, 2013
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Simulating Random Multivariate Correlated Data (Continuous Variables)

This is a repost of an example that I posted last year but at the time I only had the PDF document (written in ).  I’m reposting it directly into WordPress and I’m including the graphs. From time-to-time a researcher needs to develop a script or an application to collect and analyze data. They may also need [...]

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Simulating Random Multivariate Correlated Data (Continuous Variables)

March 11, 2013
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Simulating Random Multivariate Correlated Data (Continuous Variables)

This is a repost of an example that I posted last year but at the time I only had the PDF document (written in ).  I’m reposting it directly into WordPress and I’m including the graphs. From time-to-time a researcher needs to develop a script or an application to collect and analyze data. They may also need [...]

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Yes, the decision to try (or not) to have a child can be made rationally

March 11, 2013
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Yes, the decision to try (or not) to have a child can be made rationally

Philosopher L. A. Paul and sociologist Kieran Healy write: Choosing to have a child involves a leap of faith, not a carefully calibrated rational choice. When surprising results surface about the dissatisfaction many parents experience, telling yourself that you knew it wouldn’t be that way for you is simply a rationalization. The same is true [...]

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Hexadecimal literals in GNU R

March 11, 2013
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Recently I have used hexadecimal numbers in GNU R. The way they are parsed surprised me and is inconsistent with Java. As R Language Definition pdf only briefly mentions hexadecimal numbers here is what I have found.First I have checked the following c...

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Construct normal data from summary statistics

March 11, 2013
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Construct normal data from summary statistics

Last week there was an interesting question posted to the "Stat-Math Statistics" group on LinkedIn. The original question was a little confusing, so I'll state it in a more general form: A population is normally distributed with a known mean and standard deviation. A sample of size N is drawn [...]

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Visualization Makes Things Real

March 11, 2013
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Visualization Makes Things Real

Vision is the sense we most identify with: it tells us where we are, who we are talking to, what we are doing. It defines our world like no other sense. What we can see is real, for better or worse. Reproductive Cloning In 2003, Nigel Holmes was working on an information graphic on stem cells for Stanford Magazine. This was the result of extensive discussions with the scientists, in…

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Twitter for educators

March 11, 2013
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Twitter for educators

Why I love Twitter This post is about the What and Why of Twitter. I’ll leave more about the “How” for another day. Thanks to Priscilla Allan (whom I met on Facebook) for asking! I love Twitter. Given the choice … Continue reading →

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Discovering Argon with the 2-Sample t-Test

March 11, 2013
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Discovering Argon with the 2-Sample t-Test

I learned about Lord Rayleigh’s discovery of argon in my 2nd-year analytical chemistry class while reading “Quantitative Chemical Analysis” by Daniel Harris.  (William Ramsay was also responsible for this discovery.)  This is one of my favourite stories in chemistry; it illustrates how diligence in measurement can lead to an elegant and surprising discovery.  I find […]

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Sunday data/statistics link roundup (3/10/13)

March 11, 2013
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This is an outstanding follow up analysis to our paper on the rate of false discoveries in the medical literature. I hope that the author of the blog post will consider submitting it for publication in a journal, I think … Continue reading →

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More sequential testing for triangle tests

March 10, 2013
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More sequential testing for triangle tests

I looked before at triangle tests and at sequential testing in triangle tests (blog entry). In the latter post it was demonstrated that a sequential test is possible, without costs in desired error of the first kind. The latter because t...

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Country Portraits – Open and Embedabble

March 10, 2013
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Country Portraits – Open and Embedabble

Looking for important statistical indicators of European countries? Comparing these countries? Taking the application to your own website? Making a …Continue reading »

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Towards making my own papers reproducible

March 10, 2013
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Towards making my own papers reproducible

Much has been written about reproducible research: that scientific papers should be accompanied by the data and software sufficient to reproduce the results. It’s obviously a Good Thing. But it can be hard to stick to this ideal in practice. For my early papers, I’m not sure I can find the materials anymore, and that’s […]

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He said he was sorry

March 10, 2013
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He said he was sorry

Yes, it can be done: Hereby I contact you to clarify the situation that occurred with the publication of the article entitled *** which was published in Volume 11, Issue 3 of *** and I made the mistake of declaring as an author. This chapter is a plagiarism of . . . I wish to [...]

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Call for participation: DMApps 2013 – an International Workshop on Data Mining Applications in Industry and Government

March 10, 2013
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Call for participation: DMApps 2013 – an International Workshop on Data Mining Applications in Industry and Government

Call for participation: DMApps 2013 – an International Workshop on Data Mining Applications in Industry and Government in conjunction with PAKDD 2013, Gold Coast, Australia, April 14, 2013 http://dmapps2013.rdatamining.com To attend the workshop, you need to register for PAKDD 2013 … Continue reading →

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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #4)

March 9, 2013
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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #4)

More news about MCMSki IV! Remember, the call is still open for contributed sessions for a few more weeks, till March. 20 to be precise (make sure to contact me at bayesianstatistics@gmail.com if you are considering putting one session together). To all those who already submitted a session, thanks a lot, please stay tuned, and [...]

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