Someone pointed me to this remark by psychology researcher Daniel Gilbert: Publication is not canonization. Journals are not gospels. They are the vehicles we use to tell each other what we saw (hence “Letters” & “proceedings”). The bar for communicating to each other should not be high. We can decide for ourselves what to make […]

# Category: Miscellaneous Statistics

## Yes on design analysis, No on “power,” No on sample size calculations

Kevin Lewis points us to this paper, “Sample-Size Planning for More Accurate Statistical Power: A Method Adjusting Sample Effect Sizes for Publication Bias and Uncertainty,” by Samantha Anderson, Ken Kelley, and Scott Maxwell. My reaction: Yes, it’s reasonable, but I have two big problems with the general approach: 1. I don’t like talk of power […]

## My talk this coming Monday in the Columbia statistics department

Monday 4 Mar, 4pm in room 903 Social Work Bldg: We’ve Got More Than One Model: Evaluating, comparing, and extending Bayesian predictions Methods in statistics and data science are often framed as solutions to particular problems, in which a particular model or method is applied to a dataset. But good practice typically requires multiplicity, in […]

## My talk today (Tues 19 Feb) 2pm at the University of Southern California

At the Center for Economic and Social Research, Dauterive Hall (VPD), room 110, 635 Downey Way, Los Angeles: The study of American politics as a window into understanding uncertainty in science Andrew Gelman, Department of Statistics and Department of Political Science, Columbia University We begin by discussing recent American elections in the context of political […]

## More on that horrible statistical significance grid

Regarding this horrible Table 4: Eric Loken writes: The clear point or your post was that p-values (and even worse the significance versus non-significance) are a poor summary of data. The thought I’ve had lately, working with various groups of really smart and thoughtful researchers, is that Table 4 is also a model of their […]

## Simulation-based statistical testing in journalism

Jonathan Stray writes: In my recent Algorithms in Journalism course we looked at a post which makes a cute little significance-type argument that five Trump campaign payments were actually the $130,000 Daniels payoff. They summed to within a dollar of $130,000, so the simulation recreates sets of payments using bootstrapping and asks how often there’s […]

## Michael Crichton on science and storytelling

Javier Benitez points us to this 1999 interview with techno-thriller writer Michael Crichton, who says: I come before you today as someone who started life with degrees in physical anthropology and medicine; who then published research on endocrinology, and papers in the New England Journal of Medicine, and even in the Proceedings of the Peabody […]

## Should he go to grad school in statistics or computer science?

Someone named Nathan writes: I am an undergraduate student in statistics and a reader of your blog. One thing that you’ve been on about over the past year is the difficulty of executing hypothesis testing correctly, and an apparent desire to see researchers move away from that paradigm. One thing I see you mention several […]

## Our hypotheses are not just falsifiable; they’re actually false.

Everybody’s talkin bout Popper, Lakatos, etc. I think they’re great. Falsificationist Bayes, all the way, man! But there’s something we need to be careful about. All the statistical hypotheses we ever make are false. That is, if a hypothesis becomes specific enough to make (probabilistic) predictions, we know that with enough data we will be […]

## When doing regression (or matching, or weighting, or whatever), don’t say “control for,” say “adjust for”

This comes up from time to time. We were discussing a published statistical blunder, an innumerate overconfident claim arising from blind faith that a crude regression analysis would control for various differences between groups. Martha made the following useful comment: Another factor that I [Martha] believe tends to promote the kind of thing we’re talking […]

## How post-hoc power calculation is like a shit sandwich

Damn. This story makes me so frustrated I can’t even laugh. I can only cry. Here’s the background. A few months ago, Aleksi Reito (who sent me the adorable picture above) pointed me to a short article by Yanik Bababekov, Sahael Stapleton, Jessica Mueller, Zhi Fong, and David Chang in Annals of Surgery, “A Proposal […]

## Published in 2018

R-squared for Bayesian regression models. {\em American Statistician}. (Andrew Gelman, Ben Goodrich, Jonah Gabry, and Aki Vehtari) Voter registration databases and MRP: Toward the use of large scale databases in public opinion research. {\em Political Analysis}. (Yair Ghitza and Andrew Gelman) Limitations of “Limitations of Bayesian leave-one-out cross-validation for model selection.” {\em Computational Brain and […]

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## Published in 2018

R-squared for Bayesian regression models. {\em American Statistician}. (Andrew Gelman, Ben Goodrich, Jonah Gabry, and Aki Vehtari) Voter registration databases and MRP: Toward the use of large scale databases in public opinion research. {\em Political Analysis}. (Yair Ghitza and Andrew Gelman) Limitations of “Limitations of Bayesian leave-one-out cross-validation for model selection.” {\em Computational Brain and […]

The post Published in 2018 appeared first on Statistical Modeling, Causal Inference, and Social Science.

## Combining apparently contradictory evidence

I want to write a more formal article about this, but in the meantime here’s a placeholder. The topic is the combination of apparently contradictory evidence. Let’s start with a simple example: you have some ratings on a 1-10 scale. These could be, for example, research proposals being rated by a funding committee, or, umm, […]

The post Combining apparently contradictory evidence appeared first on Statistical Modeling, Causal Inference, and Social Science.

## Combining apparently contradictory evidence

I want to write a more formal article about this, but in the meantime here’s a placeholder. The topic is the combination of apparently contradictory evidence. Let’s start with a simple example: you have some ratings on a 1-10 scale. These could be, for example, research proposals being rated by a funding committee, or, umm, […]

The post Combining apparently contradictory evidence appeared first on Statistical Modeling, Causal Inference, and Social Science.

## Combining apparently contradictory evidence

I want to write a more formal article about this, but in the meantime here’s a placeholder. The topic is the combination of apparently contradictory evidence. Let’s start with a simple example: you have some ratings on a 1-10 scale. These could be, for example, research proposals being rated by a funding committee, or, umm, […]

The post Combining apparently contradictory evidence appeared first on Statistical Modeling, Causal Inference, and Social Science.

## “Check yourself before you wreck yourself: Assessing discrete choice models through predictive simulations”

Timothy Brathwaite sends along this wonderfully-titled article (also here, and here’s the replication code), which begins: Typically, discrete choice modelers develop ever-more advanced models and estimation methods. Compared to the impressive progress in model development and estimation, model-checking techniques have lagged behind. Often, choice modelers use only crude methods to assess how well an estimated […]

The post “Check yourself before you wreck yourself: Assessing discrete choice models through predictive simulations” appeared first on Statistical Modeling, Causal Inference, and Social Science.

## “Check yourself before you wreck yourself: Assessing discrete choice models through predictive simulations”

Timothy Brathwaite sends along this wonderfully-titled article (also here, and here’s the replication code), which begins: Typically, discrete choice modelers develop ever-more advanced models and estimation methods. Compared to the impressive progress in model development and estimation, model-checking techniques have lagged behind. Often, choice modelers use only crude methods to assess how well an estimated […]

The post “Check yourself before you wreck yourself: Assessing discrete choice models through predictive simulations” appeared first on Statistical Modeling, Causal Inference, and Social Science.

## What is probability?

This came up in a discussion a few years ago, where people were arguing about the meaning of probability: is it long-run frequency, is it subjective belief, is it betting odds, etc? I wrote: Probability is a mathematical concept. I think Martha Smith’s analogy to points, lines, and arithmetic is a good one. Probabilities are […]

The post What is probability? appeared first on Statistical Modeling, Causal Inference, and Social Science.

## What is probability?

This came up in a discussion a few years ago, where people were arguing about the meaning of probability: is it long-run frequency, is it subjective belief, is it betting odds, etc? I wrote: Probability is a mathematical concept. I think Martha Smith’s analogy to points, lines, and arithmetic is a good one. Probabilities are […]

The post What is probability? appeared first on Statistical Modeling, Causal Inference, and Social Science.