Archive for book reviews

Crossed Blades [book review]

Posted in Books with tags , , , , , , , on April 13, 2014 by xi'an

After Broken Blade and its sequel Bared Blade, Kelly McCullough wrote Crossed Blades that I had ordered along with Bared Blade. And once again I read this volume within a few evenings. It is still very enjoyable, maybe the more given that there is a continuity in the characters and the plots. However, I did prefer Bared Blade to Crossed Blades as the former was creative in terms of plot and environment. Here, in Crossed Blades, the main character Aral is facing his past, from the destruction of his religious order and of his goddess to the possible treachery of former friends and mentors, to his attempt to drown this past in top quality whisky… While dealing with an adopted teenage daughter in the midst of a typical teenage crisis. This new instalment is thus full of introspection and reminiscence of past loves, and frankly a bit dull at times, even though there is a (spoiler warning!!) massive battle against the culprits for the destruction of the order. The very end is a bit disappointing, but it also hopefully closes a chapter in the hero’s life, which means that the next volume, Blade Reforged, may run into new territories and more into simili-detective stories.  (Two more books in this Blade series are in the making!)

Bared Blade [book review]

Posted in Books with tags , , , , , , on March 23, 2014 by xi'an

As mentioned in my recent review of Broken Blade by Kelly McCullough, I had already ordered the sequel Bared Blade. And I read this second volume within a few days. Conditional on enjoying fantasy-world detective stories with supernatural beings popping in (or out) at the most convenient times, this volume is indeed very pleasant with a proper whodunnit, a fairly irrelevant McGuffin, a couple of dryads (that actually turn into…well, no spoiler!), several false trails, a radical variation on the “good cop-bad cop” duo, and the compulsory climactic reversal of fortune at the very end (not a spoiler since it is the same in every novel!). Once again, a very light read, to the point of being almost ethereal, with no pretence at depth or epics or myth, but rather funny and guaranteed 100% free of living-deads, which is a relief. I actually found this volume better than the first one, which is a rarity if you have had enough spare time to read thru my non-scientific book reviews, I am thus looking forward to the next break when I can skip through my next volume of Kelly McCullough, Crossed Blades. (And I hope I will not get more crossed with that one than I was bored with the current volume!)

Broken Blade & King of Thorns [book reviews]

Posted in Books with tags , , , on March 1, 2014 by xi'an

Over the past few weeks, I read Broken Blade by Kelly McCullough, the start to a series of novels taking place in a fantasy universe and involving the same characters. As in many recent novels I read, the main character Aral Kingslayer is more an anti-hero, not very congenial and rather drawn towards booze and self-loathing. He is one of the last remaining Assassins of a religion which goddess got killed (with very little explanations on how and why this happened). Maybe this is a good enough explanation for his current psychological state, hence the “broken” in the title, but that does not make him more endearing! The story itself is more of a sleuthing one, Aral acting as the detective for hire and another character as the client seeking to recover her inheritance. (With the more unusual add-ons of ghouls and zombies and magics. And the more usual theme of corrupted police officers.) Nothing earth-shattering and still a pleasant ride (that made me miss my metro station once!). As an indicator of how I liked it, I already ordered the sequel Bared Blade. If only to see whether the novelty does wear out… Or not!

About a year ago, I mentioned reading Lawrences’s Prince of Thorns and being rather uneasy about the central anti-hero, a 14-year old at the head of a gang of murderers and worse. I nonetheless bought the second volume, King of Thorns, a few months ago. Once again, I am unhappy about the lack of moral and basic compassion of Jorg and found it difficult to trudge through the ethic morass that King of Thorns represents… In some sense, the character gets more depth and some minimal type of humanity, but most of his actions do not make sense and the added touch of Indiana Jones at some crucial point in the story is just annoying. And I am usually adverse at the mix of science-fiction and fantasy in vague post-apocalyptic universes.  Not recommended, despite the flow of highly positive reviews…

amazonly associated thanks (& warnin’)

Posted in Books, Kids, R, Statistics with tags , , , , , , , on December 8, 2013 by xi'an

Following a now well-established pattern, let me (re)warn (the few) unwary ‘Og readers that the links to Amazon.com and to Amazon.fr found on this blog are actually susceptible to earn me a monetary gain [from 4% to 8% on the sales] if a purchase is made by the reader in the 24 hours following the entry on Amazon through this link, thanks to the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com/fr. Unlike the pattern of last year, and of the year before last, the mostly purchased item through the links happens to be related to a blog post, since it is Andrew’s book, with 318 copies of its third edition sold through the ‘Og last month! Here are some of the most exotic purchases:

As usual the books I actually reviewed along the past months, positively or negatively, were among the top purchases… Like two dozen copies of The BUGS book. And a dozen of R for dummies. And even a few of The Cartoon Introduction to Statistics. (Despite a most critical review.) Thanks to all of you using those links (for feeding further my book addiction, books that now eventually end up in the math common room in Dauphine or Warwick, once I have read them)!

Shravan’s comments on “Valen in Le Monde” [guest post]

Posted in Books, Statistics, University life with tags , , , , , , , on November 22, 2013 by xi'an

[Those are comments sent yesterday by Shravan Vasishth in connection with my post. Since they are rather lengthy, I made them into a post. Shravan is also the author of The foundations of Statistics and we got in touch through my review of the book . I may address some of his points later, but, for now, I find the perspective of a psycholinguist quite interesting to hear.]

Christian, Is the problem for you that the p-value, however low, is only going to tell you the probability of your data (roughly speaking) assuming the null is true, it’s not going to tell you anything about the probability of the alternative hypothesis, which is the real hypothesis of interest.

However, limiting the discussion to (Bayesian) hierarchical models (linear mixed models), which is the type of model people often fit in repeated measures studies in psychology (or at least in psycholinguistics), as long as the problem is about figuring out P(θ>0) or P(θ>0), the decision (to act as if θ>0) is going to be the same regardless of whether one uses p-values or a fully Bayesian approach. This is because the likelihood is going to dominate in the Bayesian model.

Andrew has objected to this line of reasoning by saying that making a decision like θ>0 is not a reasonable one in the first place. That is true in some cases, where the result of one experiment never replicates because of study effects or whatever. But there are a lot of effects which are robust and replicable, and where it makes sense to ask these types of questions.

One central issue for me is: in situations like these, using a low p-value to make such a decision is going to yield pretty similar outcomes compared to doing inference using the posterior distribution. The machinery needed to do a fully Bayesian analysis is very intimidating; you need to know a lot, and you need to do a lot more coding and checking than when you fit an lmer type of model.

It took me 1.5 to 2 years of hard work (=evenings spent not reading novels) to get to the point that I knew roughly what I was doing when fitting Bayesian models. I don’t blame anyone for not wanting to put their life on hold to get to such a point. I find the Bayesian method attractive because it actually answers the question I really asked, namely is θ>0 or θ<0? This is really great, I don’t have beat around the bush any more! (there; I just used an exclamation mark). But for the researcher unwilling (or more likely: unable) to invest the time into the maths and probability theory and the world of BUGS, the distance between a heuristic like a low p-value and the more sensible Bayesian approach is not that large.

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