Blog Archives

Statistical analysis on a dataset that consists of a population

April 25, 2015
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This is an oldie but a goodie. Donna Towns writes: I am wondering if you could help me solve an ongoing debate? My colleagues and I are discussing (disagreeing) on the ability of a researcher to analyze information on a population. My colleagues are sure that a researcher is unable to perform statistical analysis on […] The post Statistical analysis on a dataset that consists of a population appeared first…

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Statistical significance, practical significance, and interactions

April 24, 2015
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Statistical significance, practical significance, and interactions

I’ve said it before and I’ll say it again: interaction is one of the key underrated topics in statistics. I thought about this today (OK, a couple months ago, what with our delay) when reading a post by Dan Kopf on the exaggeration of small truths. Or, to put it another way, statistically significant but […] The post Statistical significance, practical significance, and interactions appeared first on Statistical Modeling, Causal…

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Political Attitudes in Social Environments

April 23, 2015
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Jose Duarte, Jarret Crawford, Charlotta Stern, Jonathan Haidt, Lee Jussim, and Philip Tetlock wrote an article, “Political Diversity Will Improve Social Psychological Science,” in which the argued that the field of social psychology would benefit from the inclusion of more non-liberal voices (here I’m using “liberal” in the sense of current U.S. politics). Duarte et […] The post Political Attitudes in Social Environments appeared first on Statistical Modeling, Causal Inference,…

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A message from the vice chairman of surgery at Columbia University: “Garcinia Camboja. It may be the simple solution you’ve been looking for to bust your body fat for good.”

April 22, 2015
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A message from the vice chairman of surgery at Columbia University:  “Garcinia Camboja. It may be the simple solution you’ve been looking for to bust your body fat for good.”

Should Columbia University fire this guy just cos he says things like this: “You may think magic is make believe but this little bean has scientists saying they’ve found the magic weight loss cure for every body type—it’s green coffee extract.” “I’ve got the No. 1 miracle in a bottle to burn your fat. It’s […] The post A message from the vice chairman of surgery at Columbia University: “Garcinia…

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Instead of worrying about multiple hypothesis correction, just fit a hierarchical model.

April 22, 2015
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Instead of worrying about multiple hypothesis correction, just fit a hierarchical model.

Pejman Mohammadi writes: I’m concerned with a problem in multiple hypothesis correction and, despite having read your article [with Jennifer and Masanao] on not being concerned about it, I was hoping I could seek your advice. Specifically, I’m interested in multiple hypothesis testing problem in cases when the test is done with a discrete finite […] The post Instead of worrying about multiple hypothesis correction, just fit a hierarchical model.…

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The feather, the bathroom scale, and the kangaroo

April 21, 2015
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The feather, the bathroom scale, and the kangaroo

Here’s something I wrote in the context of one of those “power = .06″ studies: My criticism of the ovulation-and-voting study is ultimately quantitative. Their effect size is tiny and their measurement error is huge. My best analogy is that they are trying to use a bathroom scale to weigh a feather—and the feather is […] The post The feather, the bathroom scale, and the kangaroo appeared first on Statistical…

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Online predictions from ipredict

April 21, 2015
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Following up on our post on PredictWise, Richard Barker points to this fun site of market-based predictions. It’s subtitled, “Buy and sell stocks in future political and economic events.” It’s based in New Zealand so you can bet on wacky propositions such as, “David Carter to be next High Commissioner from New Zealand to the […] The post Online predictions from ipredict appeared first on Statistical Modeling, Causal Inference, and…

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On deck this week

April 20, 2015
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Mon: New book on Bayesian analysis in ecology using Stan Tues: The feather, the bathroom scale, and the kangaroo Wed: Instead of worrying about multiple hypothesis correction, just fit a hierarchical model. Thurs: Political Attitudes in Social Environments Fri: Statistical significance, practical significance, and interactions Sat: Statistical analysis on a dataset that consists of a […] The post On deck this week appeared first on Statistical Modeling, Causal Inference, and…

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Go to PredictWise for forecast probabilities of events in the news

April 19, 2015
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Go to PredictWise for forecast probabilities of events in the news

I like it. Clear, transparent, no mumbo jumbo about their secret sauce. But . . . what’s with the hyper-precision: C’mon. “27.4%”? Who are you kidding?? (See here for explication of this point.) The post Go to PredictWise ...

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Diederik Stapel in the news, again

April 19, 2015
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Bikes . . . have “become the most common mode of transportation for criminals.” OK, that’s just ethnic profiling of Dutch people. I think they’re just gonna put the whole country on lockdown. The post Diederik Stapel in the news, again...

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