Archive for typo

a most inappropriate typo!

Posted in Statistics with tags , , , on March 29, 2020 by xi'an

mea culpa!

Posted in Books, Kids, R, Statistics, University life with tags , , , , , , on October 9, 2017 by xi'an

An entry about our Bayesian Essentials book on X validated alerted me to a typo in the derivation of the Gaussian posterior..! When deriving the posterior (which was left as an exercise in the Bayesian Core), I just forgot the term expressing the divergence between the prior mean and the sample mean. Mea culpa!!!

Statistical modeling and computation [apologies]

Posted in Books, R, Statistics, University life with tags , , , , , , , , , , , on June 11, 2014 by xi'an

In my book review of the recent book by Dirk Kroese and Joshua Chan,  Statistical Modeling and Computation, I mistakenly and persistently typed the name of the second author as Joshua Chen. This typo alas made it to the printed and on-line versions of the subsequent CHANCE 27(2) column. I am thus very much sorry for this mistake of mine and most sincerely apologise to the authors. Indeed, it always annoys me to have my name mistyped (usually as Roberts!) in references.  [If nothing else, this typo signals it is high time for a change of my prescription glasses.]

truncated t’s [typo]

Posted in pictures, Statistics with tags , , , , , on March 14, 2014 by xi'an

Last night, I received this email from Piero Foscari (im Hamburg) about my moment derivations for the absolute and the positive t distribution:

Elben, Hamburg, Feb. 21, 2013There might be two typos in the final second moment formula and its derivation (assuming no silly symmetric mistakes in my validation code): the first ν ought to be -ν, and there should be a corresponding scaling factor also for the boundary μ in Pμ,ν-2 since it arises from a change of variable. Btw in the text reference to Fig. 2 |X| wasn’t updated to X+. I hope that this is of some use.

and I checked that indeed I had forgotten the scale factor ν/(ν-2) in the t distribution with ν-2 degrees of freedom as well as the sign… So I modified the note and rearXived it. Sorry about this lack of attention to the derivation!

Typo in Biometrika 97(3): 747

Posted in Statistics, Travel, University life with tags , , , on November 4, 2010 by xi'an

Yesterday while in Philadelphia airport I got this email from Javier Rubio:

Prof. Robert,

I am a first year PhD student in the University of Warwick. I was reading your paper “Properties of nested sampling” which I found very interesting.  I have a question about it. Is the second equation in pp. 747 correct?
I think this equation is related with the first equation in pp. 12 from your paper “Importance sampling methods for Bayesian discrimination between embedded models”.
Kind regards,

Indeed, there is a typo in that this formula (page 747) should be

\widehat{Z}_1=1\bigg/\left\{\dfrac{1}{T}\,\sum_{t=1}^T {g(\theta^{(t)}) }\big/\pi(\theta^{(t)})L(\theta^{(t)})\right\}

(I checked my LaTeX code and there is a trace of a former \dfrac that got erased but was not replaced with a \big/ symbol… I am quite sorry for the typo, the more because this paper went through many revisions.) There is no typo in the corresponding chapter of Frontiers of Statistical Decision Making and Bayesian Analysis: In Honor of James O. Berger