More REML exercise

August 25, 2013
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Last week I tried exercise 1 of the SAS(R) proc mixed with R libraries lme4 and MCMCglm. So this week I aimed for exercise 2 but ended up redoing exercise 1 with nlme.Exercise 2 results gave me problems with library lme4 and latter parts of the ex...

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From SVG to probability distributions [with R package]

August 25, 2013
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From SVG to probability distributions [with R package]

Hey, To illustrate generally complex probability density functions on continuous spaces, researchers always use the same examples, for instance mixtures of Gaussian distributions or a banana shaped distribution defined on with density function: If we draw a sample from this distribution using MCMC we obtain a [scatter]plot like this one: Clearly it doesn’t really look […]

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Did Faulty Software Shut Down the NASDAQ?

August 24, 2013
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This past Thursday, the NASDAQ stock exchange shut down for just over 3 hours due to some technical problems. It's still not clear what the problem was because NASDAQ officials are being tight-lipped. NASDAQ has had a bad run of … Continue reading →

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All inference is about generalizing from sample to population

August 24, 2013
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Jeff Walker writes: Your blog has skirted around the value of observational studies and chided folks for using causal language when they only have associations but I sense that you ultimately find value in these associations. I would love for you to expand this thought in a blog. Specifically: Does a measured association “suggest” a […]The post All inference is about generalizing from sample to population appeared first on Statistical…

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Measurement error in monkey studies

August 24, 2013
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Measurement error in monkey studies

Following up on our recent discussion of combative linguist Noam Chomsky and disgraced primatologist Marc Hauser, here are some stories from Jay Livingston about monkey research. Don’t get me wrong—I eat burgers, so I’m not trying to get on my moral high horse here. But the stories do get you thinking about measurement error and […]The post Measurement error in monkey studies appeared first on Statistical Modeling, Causal Inference, and…

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Statistics professors on college football, Crimson Tide, and Buckeyes

August 23, 2013
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Statistics professors on college football, Crimson Tide, and Buckeyes

The Crimson Tide and the Buckeyes are ranked the first and second in the Associate Press preseason poll of 2013 college football season. Alabama is  going for its third consecutive national championship, which has not happened before. Meanwhile, the Ohio State has never posted consecutive undefeated/untied seasons. Are they going to defeat the odds? Prof. Mark Berliner […]

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Residuals from a logistic regression

August 23, 2013
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Residuals from a logistic regression

I always claim that graphs are important in econometrics and statistics ! Of course, it is usually not that simple. Let me come back to a recent experience. A got an email from Sami yesterday, sending me a graph of residuals, and asking me what could be done with a graph of residuals, obtained from a logistic regression ? To get a better understanding, let us consider the following dataset…

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Discrimination

August 23, 2013
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Discrimination

Sometimes it's cool to discriminate. (I mean, if Abercrombie does it...) There I said it. I'm sick and tired of people being all PC(A) about it. I think Linear Discriminant Analysis is a great way to classify your data, and I don't care who knows it. ...

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Stratifying PISA scores by poverty rates suggests imitating Finland is not necessarily the way to go for US schools

August 23, 2013
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Stratifying PISA scores by poverty rates suggests imitating Finland is not necessarily the way to go for US schools

For the past several years a steady stream of articles and opinion pieces have been praising the virtues of Finish schools and exalting the US to imitate this system. One data point supporting this view comes from the most recent … Continue reading →

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“I mean, what exact buttons do I have to hit?”

August 23, 2013
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This American Life reporter Gabriel Rhodes says: This is one of the big differences between Jon and Anthony, between scientist and non-scientist. For Jon, having a year’s worth of work suddenly thrown into question is a normal day at the office. But for Anthony, that’s not normal. And it’s not OK. The time in Jon’s […]The post “I mean, what exact buttons do I have to hit?” appeared first on…

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If you are near DC/Baltimore, come see Jeff talk about Coursera

August 23, 2013
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I'll be speaking at the Data Science Maryland meetup. The title of my presentation is "Teaching Data Science to the Masses". The talk is at 6pm on Thursday, Sept. 19th. More info here.

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GitHub renders CSV in the browser, becomes even better for social data set creation

August 23, 2013
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GitHub renders CSV in the browser, becomes even better for social data set creation

I've written in a number of places about how GitHub can be a great place to store data. Unlike basically all other web data storage sites (many of which I really like such as Dataverse and FigShare) GitHub enables deep social data set development and f...

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A critical look at “critical thinking”: deduction and induction

August 23, 2013
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A critical look at “critical thinking”: deduction and induction

I’m cleaning away some cobwebs around my old course notes, as I return to teaching after 2 years off (since I began this blog). The change of technology alone over a mere 2 years (at least here at Super Tech U) might be enough to earn me techno-dinosaur status: I knew “Blackboard” but now it’s […]

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The Flavor Connection: Mapping Commonalities in Food Flavors

August 22, 2013
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The Flavor Connection: Mapping Commonalities in Food Flavors

The Flavor Connection [scientificamerican.com] by Jan Willem Tulp for popular science magazine Scientific American maps the similarities of flavor compounds between different foods. Each food is represented by a blue dot, which is sized according to...

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Improvements to Kindle Version of BDA3

August 22, 2013
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I let Andrew know about the comments about the defective Kindle version of BDA2 and he wrote to his editor at Chapman and Hall, Rob Calver, who wrote back with this info: I can guarantee that the Kindle version of the third edition will be a substantial improvement. We publish all of our mathematics and […]The post Improvements to Kindle Version of BDA3 appeared first on Statistical Modeling, Causal Inference,…

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Chris Lane, U.S. tourism boycotts, and large relative risks on small probabilities

August 22, 2013
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Chris Lane was tragically killed (link via Leah J.) in a shooting in Duncan, Oklahoma. According to the reports, it sounds like it was apparently a random and completely senseless act of violence. It is horrifying to think that those kids were … Continue reading →

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“The comment section is open, but I’m not going to read them”

August 22, 2013
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That’s Tyler Cowen’s policy. I read almost all the comments here. I’m glad I read them, I think. Over the years, I’ve learned a lot of interesting things from the comments. Sometimes, though, I wish I hadn’t bothered. Cowen gets about 10 times as many comments as I do, so I think in his case […]The post “The comment section is open, but I’m not going to read them” appeared…

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More Bayesian Football Models

August 22, 2013
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More Bayesian Football Models

I recently had a lot of fun coding up a Bayesian Poisson model of football scores in the Spanish la Liga. I describe the model, implemented using R and JAGS, in these posts: part 1, part 2, part 3. Turns out that Gianluca Baio and Marta Blangiardo al...

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Numbersense Pros: Interview with Dean Baker

August 22, 2013
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Numbersense Pros: Interview with Dean Baker

Today's Numbersense Pros features Dean Baker, an economist and co-director of the Center for Economic and Policy Research. His blog, Beat the Press, is my first stop for economics news. What attracts me is his data-first attitude. Every post on his site is about interpreting economic data--there is none of the data-free theorizing that is typical on other economics blogs. Baker adopts a cynical, almost satirical, tone, which is fun…

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How to get started in analytics

August 22, 2013
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How to get started in analytics

I will be giving a webinar today (Thursday) at 1 pm EST. The topic is Big Data and Marketing. I will give some tips on how to get into the data game. Click here to register. The registration link is...

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Workshop for Women in Machine Learning

August 21, 2013
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This might interest some of you: CALL FOR ABSTRACTS Workshop for Women in Machine Learning Co-located with NIPS 2013, Lake Tahoe, Nevada, USA December 5, 2013 http://www.wimlworkshop.org Deadline for abstract submissions: September 16, 2013 WORKSHOP DESCRIPTION The Workshop for Women in Machine Learning is a day-long event taking place on the first day of NIPS. […]The post Workshop for Women in Machine Learning appeared first on Statistical Modeling, Causal Inference,…

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All the Open Datasets from New York City Visualized in a Single View

August 21, 2013
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All the Open Datasets from New York City Visualized in a Single View

"Visualizing NYC's Open Data" [chriswhong.com] by self-proclaimed urbanist, map maker and data junkie Chris Wong provides a single view of the more than 1,100 open datasets made available by New York City. The visualization of the "dataset of datase...

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Treading a New Path for Reproducible Research: Part 1

August 21, 2013
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Treading a New Path for Reproducible Research: Part 1

Discussions about reproducibility in scientific research have been on the rise lately, including on this blog. There are many underlying trends that have produced this increased interest in reproducibility: larger and larger studies being harder to replicate independently, cheaper data … Continue reading →

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