peer reviews on-line or peer community?

Posted in Statistics with tags , , , , , , , , , on September 20, 2018 by xi'an

Nature (or more precisely some researchers through Nature, associated with the UK Wellcome Trust, the US Howard Hughes Medical Institute (hhmo), and ASAPbio) has (have) launched a call for publishing reviews next to accept papers, one way or another, which is something I (and many others) have supported for quite a while. Including for rejected papers, not only because making these reviews public diminishes on principle the time involved in re-reviewing re-submitted papers but also because this should induce authors to revise papers with obvious flaws and missing references (?). Or abstain from re-submitting. Or publish a rejoinder addressing the criticisms. Anything that increases the communication between all parties, as well as the perspectives on a given paper. (This year, NIPS allows for the posting of reviews of rejected submissions, which I find a positive trend!)

In connection with this entry, I am still most sorry that I could not pursue the [superior in my opinion] project of Peer Community in computational statistics, for the time requested by Biometrika editing is just too important [given my current stamina!] for me to handle another journal (or the better alternative to a journal!). I hope someone else can take over the project and create the editorial team needed to run it.

And yet again in connection with this post (!), Andrew posted an announcement about the launch of, an on-line publication forum launched by Harry Crane and Ryan Martin, where the authors handle the peer review process from A to Z, including choosing the reviewers, whose reviews may be public or not, taken into account or not. Once published, the papers are open to comments from users, which constitutes a form of post-publication peer-review. Albeit a weak one in my opinion as the weakness of all such open depositories is the potential lack of interest of and reaction from the community. Incidentally, there is a $10 fee per submission for maintenance. Contrary to Peer Community in… the copyright is partly transferred to, which apparently prevents further publication in another journal.

ASA opposes USDA plan likely to undermine economic research service (ERS) work [repost]

Posted in Statistics with tags , , , , , , on September 19, 2018 by xi'an

The American Statistical Association (ASA) is actively opposing a recent United States Department of Agriculture (USDA) proposal to realign and relocate the Economic Research Service (ERS). The ASA’s concern is that moving ERS—a federal statistical agency and an internationally respected agricultural economics research institution—would undermine its work and product quality, thereby also affecting evidence-based policymaking in the USDA and food and agriculture more generally.

Le Monde puzzle [#1067]

Posted in Books, Kids, R with tags , , , , , , , on September 19, 2018 by xi'an

The second Le Monde mathematical puzzle in the new competition is sheer trigonometry:

When in the above figures both triangles ABC are isosceles and the brown segments are all of length 25cm, find the angle in A and the value of DC², respectively.

This could have been solved by R coding the various possible angles of the three segments beyond BC until the isosceles property is met, but it went much faster by pen and paper, leading to an angle of π/9 in the first case and a square of 1250 in the second case. The third puzzle is basic arithmetic that only seems solvable by enumeration…

Nature tidbits

Posted in Books, Statistics, University life with tags , , , , , , , , , , , on September 18, 2018 by xi'an

In the Nature issue of July 19 that I read in the plane to Singapore, there was a whole lot of interesting entries, from various calls expressing deep concern about the anti-scientific stance of the Trump administration, like cutting funds for environmental regulation and restricting freedom of communication (ETA) or naming a non-scientist at the head of NASA and other agencies, or again restricting the protection of species, to a testimony of an Argentinian biologist in front of a congressional committee about the legalisation of abortion (which failed at the level of the Agentinian senate later this month), to a DNA-like version of neural network, to Louis Chen from NUS being mentioned in a career article about the importance of planning well in advance one’s retirement to preserve academia links and manage a new position or even career. Which is what happened to Louis as he stayed head of NUS after the mandatory retirement age and is now emeritus and still engaged into research. (The article made me wonder however how the cases therein had be selected.) It is actually most revealing to see how different countries approach the question of retirements of academics: in France, for instance, one is essentially forced to retire and, while there exist emeritus positions, it is extremely difficult to find funding.

“Louis Chen was technically meant to retire in 2005. The mathematician at the National University of Singapore was turning 65, the university’s official retirement age. But he was only five years into his tenure as director of the university’s new Institute for Mathematical Sciences, and the university wanted him to stay on. So he remained for seven more years, stepping down in 2012. Over the next 18 months, he travelled and had knee surgery, before returning in summer 2014 to teach graduate courses for a year.”

And [yet] another piece on the biases of AIs. Reproducing earlier papers discussed here, with one obvious reason being that the learning corpus is not representative of the whole population, maybe survey sampling should become compulsory in machine learning training degrees. And yet another piece on why protectionism is (also) bad for the environment.

Wow! [#2]

Posted in Mountains, pictures, Running with tags , , , , , , , , , , , , , , on September 17, 2018 by xi'an


Posted in Books, pictures, Running, Statistics, University life with tags , , , , , , , on September 17, 2018 by xi'an

My Warwick colleagues Nick Tawn [who also is my most frequent accomplice to running, climbing and currying in Warwick!] and Gareth Robert have just arXived a paper on QuanTA, a new parallel tempering algorithm that Nick designed during his thesis at Warwick, which he defended last semester. Parallel tempering targets in parallel several powered (or power-tempered) versions of the target distribution. With proposed switches between adjacent targets. An improved version transforms the local values before operating the switches. Ideally, the transform should be the composition of the cdf and inverse cdf, but this is impossible. Linearising the transform is feasible, but does not agree with multimodality, which calls for local transforms. Which themselves call for the identification of the different modes. In QuanTA, they are identified by N parallel runs of the standard, or rather N/2 to avoid dependence issues, and K-means estimates. The paper covers the construction of an optimal scaling of temperatures, in that the difference between the temperatures is scaled [with order 1/√d] so that the acceptance rate for swaps is 0.234. Which in turns induces a practical if costly calibration of the temperatures, especially when the size of the jump is depending on the current temperature. However, this cost issue is addressed in the paper, resorting to the acceptance rate as a proxy for effective sample size and the acceptance rate over run time to run the comparison with regular parallel tempering, leading to strong improvements in the mixture examples examined in the paper. The use of machine learning techniques like K-means or more involved solutions is a promising thread in this exciting area of tempering, where intuition about high temperatures can be actually misleading. Because using the wrong scale means missing the area of interest, which is not the mode!


Posted in pictures, Running with tags , , , , , , on September 16, 2018 by xi'an