Excel R Add In

March 9, 2015
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The statistical programming environment R is a fantastic tool for data analysis and has a huge range of add on packages that enable just about any statistical method to be implemented quickly. R is essentially a programming tool so is driven by typing ...

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The Value of Illustrating Numbers

March 9, 2015
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The Value of Illustrating Numbers

Showing data isn’t always about trying to convey an insight, or giving people the means to understand the intricacies of data. It can also be a tool to communicate a fact, an amount, or an issue beyond just the sheer numbers. Data illustration is poorly understood, but it can be very powerful. About a year ago, … Continue reading The Value of Illustrating Numbers

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Some More Results on the Theory of Statistical Learning

March 8, 2015
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Some More Results on the Theory of Statistical Learning

Yesterday, I did mention a popular graph discussed when studying theoretical foundations of statistical learning. But there is usually another one, which is the following, As previously, it is a graph with the risk on the -axis, the red line being on the training sample, and the black line on the validation sample, as a function of something that can be related to the complexity of the model. Let us…

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Divide and destroy in statistics teaching

March 8, 2015
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Divide and destroy in statistics teaching

A reductionist approach to teaching statistics destroys its very essence I’ve been thinking a bit about systems thinking and reductionist thinking, especially with regard to statistics teaching and mathematics teaching. I used to teach a course on systems thinking, with … Continue reading →

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Divide and destroy in statistics teaching

March 8, 2015
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Divide and destroy in statistics teaching

A reductionist approach to teaching statistics destroys its very essence I’ve been thinking a bit about systems thinking and reductionist thinking, especially with regard to statistics teaching and mathematics teaching. I used to teach a course on systems thinking, with … Continue reading →

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Mary Baker Eddy vs. Mohammad (2); Twain advances

March 8, 2015
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For yesterday, I hated to say no to one of the philosophical founders of the modern world, but the argument from Anonymous carries the day: I go with Twain though. He had the common sense and common decency to write stories about America. After being questioned on this, Anonymous followed up: The Greeks had or […] The post Mary Baker Eddy vs. Mohammad (2); Twain advances appeared first on Statistical…

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Causal Impact from Google

March 8, 2015
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Bill Harris writes: Did you see http://blog.revolutionanalytics.com/2014/09/google-uses-r-to-calculate-roi-on-advertising-campaigns.html? Would that be something worth a joint post and discussion from you and Judea? I then wrote: Interesting. It seems to all depend on the choice of “control time series.” That said, it could still be a useful method. Bill replied: The good: Bayesian approaches made very approachable […] The post Causal Impact from Google appeared first on Statistical Modeling, Causal Inference, and…

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SAS PROC MCMC example in R: Nonlinear Poisson Regression Multilevel Random-Effects Model

March 8, 2015
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I am slowly working my way through the PROC MCMCexamples. Regarding these data, the SAS manual says: 'This example uses the pump failure data of Gaver and O’Muircheartaigh (1987) to illustrate how to fit a multilevel random-effects model with PROC ...

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Some Intuition About the Theory of Statistical Learning

March 7, 2015
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Some Intuition About the Theory of Statistical Learning

While I was working on the Theory of Statistical Learning, and the concept of consistency, I found the following popular graph (e.g. from  thoses slides, here in French) The curve below is the error on the training sample, as a function of the size of the training sample. Above, it is the error on a validation sample. Our learning process is consistent if the two converge. I was wondering if…

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Round 2 begins! Plato (1) vs. Mark Twain (4)

March 7, 2015
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Round 2 begins!  Plato (1) vs. Mark Twain (4)

Yesterday we reached the end of round 1, and I’m sorry but we’re voting Bono off the island. There was no particular killer argument in favor of John Waters, but the forthcoming showdown between Judy Garland and the Baltimore icon is just too good to pass up. So here’s what we have so far: And […] The post Round 2 begins! Plato (1) vs. Mark Twain (4) appeared first on…

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Interactive demonstrations for linear and Gaussian process regressions

March 7, 2015
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Interactive demonstrations for linear and Gaussian process regressions

Here’s a cool interactive demo of linear regression where you can grab the data points, move them around, and see the fitted regression line changing. There are various such apps around, but this one is particularly clean: (I’d like to credit the creator but I can’t find any attribution at the link, except that it’s […] The post Interactive demonstrations for linear and Gaussian process regressions appeared first on Statistical…

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First World problems: Stan edition

March 7, 2015
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Jonah writes: First of all, every time I type ‘shinyapps’ the autocorrect replaces it with ‘chin-ups’. It was amusing but now it’s just annoying. You’d think Apple would have added the ability for the autocorrect to notice that I keep changing it back to “shinyapps” without making me manually add it as an exception. That’s […] The post First World problems: Stan edition appeared first on Statistical Modeling, Causal Inference,…

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Statistics job opening . . . at the NBA!

March 7, 2015
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Jason Rosenfeld writes: I work for the NBA League Office headquarters in New York City. I’m the Director of Basketball Analytics here at the NBA, and I’m again recruiting analysts. More information on the roles I’m trying to fill can be found here (peopleclick.com). I’m open to both undergraduate and graduate students. I’d be perfect […] The post Statistics job opening . . . at the NBA! appeared first on…

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Some data science principles from Gelman, Rosling and me

March 6, 2015
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Some data science principles from Gelman, Rosling and me

I discovered Hans Rosling's Gapminder work when I first started Junk Charts almost ten year ago, with this series of posts. So I was very excited to meet Hans yesterday at the Data, Children and Post-2015 Agenda Event hosted by the UNICEF Data and Analytics Section. And he gave a marvellous talk. I came away touched in equal parts by his humanity, the animated passion for his subject, and the…

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John Waters (1) vs. Bono; Garland advances

March 6, 2015
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John Waters (1) vs. Bono; Garland advances

For yesterday‘s contest, Jonathan warns us what might happen if we invite Dorothy: Only downside: Liza might show up. And the best argument for the Rev come from Bruce: It would be interesting to hear The Rev Al explain . . . during any of his many meetings with the President, has Obama ever hit […] The post John Waters (1) vs. Bono; Garland advances appeared first on Statistical Modeling,…

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“The Saturated Fat Studies: Set Up to Fail”

March 6, 2015
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Russ Lyons points me to this recent magazine article by Martijn Katan and a research article, “Diet and Serum Cholesterol: Do zero correlations negate the relationship?” by David Jacobs, Joseph Anderson, and Henry Blackburn, and this video by Michael Greger. This is interesting stuff, especially as the ultimate truth is still very unknown. It’s good […] The post “The Saturated Fat Studies: Set Up to Fail” appeared first on Statistical…

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Probability Theory: Convergence in Distribution Problem

March 6, 2015
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Let's solve some theoretical problem in probability, specifically on convergence. The problem below is originally from Exercise 5.42 of Casella and Berger (2001). And I just want to share my solution on this. If there is an incorrect argument below, I ...

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Create a custom PDF and CDF in SAS

March 6, 2015
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Create a custom PDF and CDF in SAS

In my previous post, I showed how to approximate a cumulative density function (CDF) by evaluating only the probability density function. The technique uses the trapezoidal rule of integration to approximate the CDF from the PDF. For common probability distributions, you can use the CDF function in Base SAS to […] The post Create a custom PDF and CDF in SAS appeared first on The DO Loop.

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Banned!

March 6, 2015
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Banned!

This is not really news any more, but I still think it's an interesting story. Last week the journal Basic and Applied Social Psychology has published an editorial setting out their views (or rather prescriptions) for how statistica...

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How to shoot yourself in the foot with various statistical philosophies

March 6, 2015
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I've long been a fan of "How to shoot yourself in the foot" jokes. Having shot myself in the foot with different programming languages -- particularly with C -- I was thinking about how one might shoot oneself in the foot with various statistical ...

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A puzzle about the latest test ban (or ‘don’t ask, don’t tell’)

March 6, 2015
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A puzzle about the latest test ban (or ‘don’t ask, don’t tell’)

A large number of people have sent me articles on the “test ban” of statistical hypotheses tests and confidence intervals at a journal called Basic and Applied Social Psychology (BASP)[i]. Enough. One person suggested that since it came so close to my recent satirical Task force post, that I either had advance knowledge or some kind […]

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Brand and Product Category Representation: Precursors to Preference Construction

March 5, 2015
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Brand and Product Category Representation: Precursors to Preference Construction

Evidently, preference is contextual, or so The Hershey's Company claims in their advertising. I agree and will not repeat the argument made in a previous post on incorporating preference construction into the choice modeling process.Within the framewor...

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Granger Causality & Seasonal Adjustment

March 5, 2015
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Granger Causality & Seasonal Adjustment

One decision that we often have to make when modelling with time-series data is whether to use "seasonally adjusted" data, or the original (unadjusted) data. In some cases the decision is effectively made for us - only the seasonally adjusted data are ...

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