Archive for xkcd

following versions [xkcd reposted]

Posted in Books, Kids, University life with tags , , on November 18, 2019 by xi'an

size matters

Posted in Statistics with tags , , , , , on May 27, 2019 by xi'an

how to annoy a statistician [xkcd redux]

Posted in Books, pictures, Statistics, University life with tags , , , , on March 24, 2019 by xi'an

error bars [reposted]

Posted in Books, Kids, pictures, Statistics, University life with tags , , , , , on March 3, 2019 by xi'an

A definitely brilliant entry on xkcd that reflects upon the infinite regress of producing error evaluations that are based on estimates. A must for the next class when I introduce error bars and confidence intervals!

leave Bayes factors where they once belonged

Posted in Statistics with tags , , , , , , , , , , on February 19, 2019 by xi'an

In the past weeks I have received and read several papers (and X validated entries)where the Bayes factor is used to compare priors. Which does not look right to me, not on the basis of my general dislike of Bayes factors!, but simply because this seems to clash with the (my?) concept of Bayesian model choice and also because data should not play a role in that situation, from being used to select a prior, hence at least twice to run the inference, to resort to a single parameter value (namely the one behind the data) to decide between two distributions, to having no asymptotic justification, to eventually favouring the prior concentrated on the maximum likelihood estimator. And more. But I fear that this reticence to test for prior adequacy also extends to the prior predictive, or Box’s p-value, namely the probability under this prior predictive to observe something “more extreme” than the current observation, to quote from David Spiegelhalter.

US elections [xkcd repost]

Posted in Books, Kids, Travel with tags , , , , , , on November 6, 2018 by xi'an

Randall Munroe of xkcd has designed this massive map of the US elections with links to all candidates and random places that I first mistook for voting stations (this would have been great!, to highlight how would-be voters can be discouraged from voting in some districts), as well as a few hidden comics and places irrelevant for the elections. (Warning: The above is a static copy!) With the great subtext that to edit the map readers need to submit their ballot before on November 7th.

curve fittings [xkcd]

Posted in Books, Kids with tags , , , , , , on November 4, 2018 by xi'an