## Any P-Value Distinguishable from Zero is Insufficiently Informative

May 23, 2015
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## My favorite R bug

May 23, 2015
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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 call it my favorite bug, as it is easy to commit and (thanks to R’s overly helpful nature) takes longer than it should to find. The … Continue reading My favorite R bug → Related posts: My Favorite Graphs Random Test/Train…

## Kaiser’s beef

May 23, 2015
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The Numbersense guy writes in: Have you seen this? It has one of your pet peeves… let’s draw some data-driven line in the categorical variable and show significance. To make it worse, he adds a final paragraph saying essentially this is just a silly exercise that I hastily put together and don’t take it seriously! […] The post Kaiser’s beef appeared first on Statistical Modeling, Causal Inference, and Social Science.

## No Hesitations is Not a Phishing Site!

May 23, 2015
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Google's "automatic system" a few days ago "determined" that No Hesitations (fxdiebold.blogspot.com) was a phishing site. (Phishing sites attempt to scam users into revealing credit card numbers, etc. No Hesitations is not a phishing site! Indeed ...

## Parametric Inference: Likelihood Ratio Test Problem 2

May 23, 2015
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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 $\mu$ and known variance $\sigma^2$, plot the power functio...

## Maximum Likelihood Estimation & Inequality Constraints

May 23, 2015
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This post is prompted by a question raised by Irfan, one of this blog's readers, in some email correspondence with me a while back.The question was to do with imposing inequality constraints on the parameter estimates when applying maximum likelihood e...

## 36-402, Advanced Data Analysis, Spring 2015: Self-Evaluation and Lessons Learned

May 23, 2015
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Attention conservation notice: 2000+ words of academic navel-gazing about teaching a weird class in an obscure subject at an unrepresentative school; also, no doubt, more complacent than it ought to be. Once again, it's the brief period between submi...

## Simulation-based power analysis using proportional odds logistic regression

May 22, 2015
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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 ordinal scale (e.g., the numerical rating scale for pain). It may be reasonable to evaluate the results of this trial using a proportional odds cumulative logit […]

## R Now Contains 150 Times as Many Commands as SAS

May 22, 2015
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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 you the trouble of foraging through that tome, I’ve pasted it below. … Continue reading →

## John Lott as possible template for future career of “Bruno” Lacour

May 22, 2015
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The recent story about the retracted paper on political persuasion reminded me of the last time that a politically loaded survey was discredited because the researcher couldn’t come up with the data. I’m referring to John Lott, the “economist, political commentator, and gun rights advocate” (in the words of Wikipedia) who is perhaps more well […] The post John Lott as possible template for future career of “Bruno” Lacour appeared…

## Should I tell students that the maximum score in the class is 137?

May 22, 2015
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This op-ed by Richard Thaler caught my attention because I have a similar experience. In my statistics classes, I have noticed a pattern: if the mid-term exam is hard, with a lower average score (say 75-80%), the students look crestfallen and feel that they did not learn; eventually, when it comes to evaluating the instructor, I receive lower grades, with comments indicating that I have not taught them properly to…

## Creativity is the ability to see relationships where none exist

May 22, 2015
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Brent Goldfarb and Andrew King, in a paper to appear in the journal Strategic Management, write: In a recent issue of this journal, Bettis (2012) reports a conversation with a graduate student who forthrightly announced that he had been trained by faculty to “search for asterisks”. The student explained that he sifted through large databases […] The post Creativity is the ability to see relationships where none exist appeared first…

May 21, 2015
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## BREAKING . . . Princeton decides to un-hire Kim Jong-Un for tenure-track assistant professorship in aeronautical engineering

May 21, 2015
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Full story here. Here’s the official quote: As you’ve correctly noted, at this time the individual is not a Princeton University employee. We will review all available information and determine next steps. And here’s what Kim has to say: I’m gathering evidence and relevant information so I can provide a single comprehensive response. I will […] The post BREAKING . . . Princeton decides to un-hire Kim Jong-Un for tenure-track…

## Bond Yields, Macro Fundamentals, and Policy

May 20, 2015
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Greetings my friends from Eurovision in Vienna. Yes, OK, that's not exactly the real reason I'm here, but still...As I said in an earlier post that stressed DNS/AFNS yield-curve modeling with the zero lower bound imposed, "although ...

## A Pleasant Surprise

May 20, 2015
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I could scarcely believe my good fortune when I opened the following email earlier today:Dear Dr Giles,Congratulations, your paper “Being ‘in’ assessment: The ontological layer(ing) of assessment practice” published in Journal of Applied R...

## “In my previous post on the topic, I expressed surprise at the published claim but no skepticism”

May 20, 2015
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Don’t believe everything you read in the tabloids, that’s for sure. P.S. I googled to see what else was up with this story and found this article which reported that someone claimed that Don Green’s retraction (see above link for details) was the first for political science. I guess it depends on how you define […] The post “In my previous post on the topic, I expressed surprise at the…

## EuroVis Running Club

May 20, 2015
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I’m organizing a very informal running club at EuroVis next week. If you’re attending the conference, don’t forget to bring your running shoes and leave your excuses at home. This is even less organized than than the VIS running club. I’m not going to have you fill out a form. Instead, just drop me an … Continue reading EuroVis Running Club

## Clusters Powerful Enough to Generate Their Own Subspaces

May 20, 2015
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Cluster are groupings that have no external label. We start with entities described by a set of measurements but no rule for sorting them by type. Mixture modeling makes this point explicit with its equation showing how each measurement is an independe...

## Is it species or is it batch? They are confounded, so we can’t know

May 20, 2015
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In a 2005 OMICS paper, an analysis of human and mouse gene expression microarray measurements from several tissues led the authors to conclude that "any tissue is more similar to any other human tissue examined than to its corresponding mouse tissue". Note that this was a rather surprising result given how similar tissues are between species.