There was a really interesting talk given by Mathias Shindler (long time editor of German Wikipedia) at the 39C3 conference about this topic a few months back that is worth a watch for anyone interested in the issue: https://youtu.be/fKU0V9hQMnY
88 karma · joined August 10, 2020
There was a really interesting talk given by Mathias Shindler (long time editor of German Wikipedia) at the 39C3 conference about this topic a few months back that is worth a watch for anyone interested in the issue: https://youtu.be/fKU0V9hQMnY
- The characteristic function of a random variable X is defined as the function that maps t --> ExpectedValue[ exp( i * t * X ) ]
- Computing this expected value is the same as regarding t as a constant and integrating the function x --> exp( i * t * x) with respect to the distribution of X, i.e. if X has the density f, we compute the integral of f(x) * exp( i * t * x) with respect to x over the domain of f.
- on the other hand: computing the Fourier transform of f (here representing the density of X) and evaluating it at point t (i.e. computing (F(f))(t) if F represents the Fourier transform) is the same as fixing t and computing the integral of f(x) * exp( -i * t * x) with respect to x.
- Rearranging the integrand in the previous expression to f(x) * exp( i * -t * x), we see that it is the same as the integrand used in the characteristic function, only with a -t instead of a t.
Hope that helps :)
In my own experience teaching teaching probability theory to physicists and engineers, establishing this connection is often a good way of helping people build intuition for why characteristic functions are so useful, why they crop up everywhere in probability theory, and why we can extract so much useful information about a distribution by looking at the characteristic function (since this group of students tends to already be rather familiar with Fourier-transforms).
Despite it being a non-starter from a pragmatic standpoint, we could for instance easily imagine a novel numeral type that encodes the set S = {a + b·π where a and b are integers} (we can encode integers quite easily and all we need to reposesent such a number in silico is to encode a and b). Using such a numeral type, we are able to do exact arithmetic if our operations are restricted to addition and subtraction (and if we are content with fractional representation of numbers as being considered "exact", we can also do division and multiplication although we would have to work within the larger set S' = { (a + b·π) / (c + d·π) where, a, b, c, and d are integers and c·d ≠ 0} rather than within S).
I don't have direct evidence for my speculations, but I presume the reason [fraktur](https://en.wikipedia.org/wiki/Fraktur) was more common in mathematics back in the days is largely down to articles having to be type-set using movable type. If you insisted on using ℝ over 𝕽, you were likely to make life considerably harder for your printer (which in turn meant higher printing costs), since they would be considerably more likely to have to cast new types. As printing was modernized and movable type was replaced by more flexible printing-technologies, this pragmatic reason for preferring one glyph over the other went away. Another explanation/contributing factor is that the switch seems to have occurred in tandem with the barycenter of mathematics switching away from continental Europe and towards the US in the post-WWII period (at least if we disregard Soviet mathematics which also flourished in this period, but which was largely published in Russian). The average American would probably be less familiar with 𝕽 and other fraktur glyphs than the average German.
There are not really any known effective clinical interventions (be they in the form of medicine, therapy, or things like more exercise), and a 10% improvement is better than nothing (clinical therapy (notably Cognitive Behavioral Therapy) is generally believed to be more effective but not by that much and it is financially out of reach for many people who are able to afford medication).
The problem with talking about doing "things that will help them" is that we don't really have a lot of effective clinical interventions. Even the most common interventions (SSRIs, Congnitive Behavioral Therapy, physical exercise, etc.) are not really that effective at treating depression and have little to no effect in large parts of the affected population. That being said, these treatments _do_ work for some people so they should definitely not be dismissed out of hand (although it may in some cases be regression to the mean more than anything else, i.e. if you get better after a while on your own but have undergone treatments of one form or another you may erroneously believe your most recent treatment was effective).
Main Paper (Jager and Leek): ttps://doi.org/10.1093/biostatistics/kxt007
Response papers:
- Yoav Benjamini and Yotam Hechtlinger: https://doi.org/10.1093/biostatistics/kxt032
- David R. Cox: https://doi.org/10.1093/biostatistics/kxt033
- Andrew Gelman and Keith O'Rourke: https://doi.org/10.1093/biostatistics/kxt034
- Steven N. Goodman: https://doi.org/10.1093/biostatistics/kxt035
- John P. A. Ioannidis (the spicy response): https://doi.org/10.1093/biostatistics/kxt036
- Martijn J. Schuemie, Patrick B. Ryan, Marc A. Suchard, Zach Shahn, and David Madigan: https://doi.org/10.1093/biostatistics/kxt037
Jaeger and Leeks' rejoinder to the responses: https://doi.org/10.1093/biostatistics/kxt038edit: fixed some formatting and link to main paper
From the abstract of the paper: "...Exploiting exogenous export demand shocks, we show that non-business managers share profits with their workers, whereas business managers do not. But consistent with our first set of results, these business managers show no greater ability to increase sales or profits in response to exporting opportunities..."
Edit: supported since 2018 https://github.com/mastodon/mastodon/pull/8703
I admit that it is a trickly problem, and I agree that Carlsen's behavior here is not beyond reproach. Withdrawing from the tournament only after having lost a game makes the statement much less impactfull since one can not discount the possibility that he's just being a rather sore looser. I would personally have respected his decision much more if he had followed his impulse (again, referred to in his statement) to withdraw as soon as Niemann had been invited to the tournament in the first place.
1. There is quite a difference between compulsory auditing (what the post you reply to refers to) and the government directly controlling industry.
2. In other industries this is quite commonplace and hasn't led to government takeover of industries (banking comes to mind. In their regulatory implementation on the Basel III accords developed in response to the 2008 financial crisis, both the UK and EU mandate government audits to ensure compliance with stress-testing and and leverage requirements; the US is also a signatory to these accords, but I am less familiar with their implementation into US law).
I'm not personally a huge fan of this approach, but I don't find the argument that government oversight is a slippery slope to totalitarianism that persuasive. In my opinion, a much a stronger critique of mandatory government audits is that they are often not that effective at preventing the negative outcomes they set out to prevent but still massively increase the legal complexity of operating in (or entering) a given industry without falling afoul of the law.
Also (as an aside irrelevant to my above question), I think you greatly overestimate the number of people who subscribe to a labour theory of value. Personally, I don't recall encountering people who subscribed to it other than far-left shitposters on twitter (who are definitely a minority, although a rather vocal one).
Unless we abolish corporations as a concept, how exactly do you effectively propose that we "outlaw all cartelization" in a way that isn't just outlawing unions while keeping capital interests unified?
tl;dr: unions complement the inherrent concentration of capital interests in modern ecconomies and are no more inherently like cartels than the corporate form itself.