Blog Archives

A case in which metric data are better analyzed by an ordinal model

August 17, 2015
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A case in which metric data are better analyzed by an ordinal model

Here we consider some data that might have been smoothly distributed over a metric scale, but ended up being concentrated on only a few values. The usual treatment of the data as normally or t-distributed is not appropriate, and instead the data are bi...

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Bayesian meta-analysis provides high-precision estimate of cosmic impact event at ~12,800 years before 1950

August 3, 2015
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Bayesian meta-analysis provides high-precision estimate of cosmic impact event at ~12,800 years before 1950

A recently published article in PNAS reports a Bayesian meta-analysis of data from 354 samples from 23 geological sites on 4 continents, yielding a 95% credible interval from 12,835 to 12,735 years before 1950 for the cosmic impact event that formed th...

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Laplace is visited by Doing Bayesian Data Analysis

July 25, 2015
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Laplace is visited by Doing Bayesian Data Analysis

After a post from almost two years ago inviting folks to pose the book with famous Bayesians or non-Bayesians (deceased or not), the book has finally visited a monument to Laplace! Shown below (scroll down) are photos kindly taken by Carlos Ungil. Than...

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The Bayesian New Statistics: Two Historical Trends Converge

May 14, 2015
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The Bayesian New Statistics: Two Historical Trends Converge

If not null hypothesis significance testing, then what? If not p values, then confidence intervals? If not NHST, then Bayes factors? Both? Neither? These issues are addressed in a new manuscript titled The Bayesian New Statistics: Two Historical Trends...

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Updated DBDA2E programs for number of MCMC chains and parallel chains in runjags

May 7, 2015
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Updated DBDA2E programs for number of MCMC chains and parallel chains in runjags

The DBDA2E programs have been updated so they deal better with parallel chains in runjags and the number of cores available on your computer. The new programs are available as this zip folder also linked at the book's software page. There are 29 modifi...

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Graphics Window for MacOS and RStudio Server

May 2, 2015
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It's been a recurring headache to get graphics windows to open seamlessly in MacOS and Windows, running RStudio locally and RStudio Server. A solution has been proposed by Professor David Zeitler. He has modified the openGraph function in the DBDA2E-ut...

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Informed priors for Bayesian comparison of two groups

April 29, 2015
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The BEST programs, for Bayesian estimation of two groups, were written with generic vague priors only minimally informed by the scale of the data. Here are new versions of the programs that are better suited for specifying informed priors.A little back...

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Final days for early registration prices at Stats Camp (including Bayesian course)

April 27, 2015
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Final days for early registration prices at Stats Camp (including Bayesian course)

Early registration prices end this week for Doing Bayesian Data Analysis, June 1 - 5, 2015, a five-day course offered through Stats Camp convened in Dallas, Texas.The web page for the June 1-5 workshop is here.Other workshops are listed here. 

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Bayesian comparison of groups using Python emcee

April 24, 2015
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Bayesian comparison of groups using Python emcee

Prof. Brain Blais has implemented the BEST model of two groups in emcee, a Python system for MCMC sampling. See his post about it here.

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Doing Bayesian data analysis again at Bernoulli’s grave

April 14, 2015
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Doing Bayesian data analysis again at Bernoulli’s grave

The 2nd Edition of the book visited the grave of Jacob Bernoulli (1655-1705) in Basel, Switzerland. Jacob Bernoulli pre-dated Bayes (1701-1761), of course, but Bernoulli established foundational concepts and theorems of probability. The photos below we...

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