Claim: memeticity in a scientific field is mostly determined, not by the most competent researchers in the field, but instead by roughly-median researchers. We’ll call this the “median researcher problem”.
Prototypical example: imagine a scientific field in which the large majority of practitioners have a very poor understanding of statistics, p-hacking, etc. Then lots of work in that field will be highly memetic despite trash statistics, blatant p-hacking, etc. Sure, the most competent people in the field may recognize the problems, but the median researchers don’t, and in aggregate it’s mostly the median researchers who spread the memes.
(Defending that claim isn’t really the main focus of this post, but a couple pieces of legible evidence which are weakly in favor:
- People did in fact try to sound the alarm about poor statistical practices well before the replication crisis, and yet practices did not change, so clearly at least some people did in fact see the problem and were in fact not memetically successful at the time. The claim is more general than just statistics-competence and replication, but at least in the case of the replication crisis it seems like the model must be at least somewhat true.
- Again using the replication crisis as an example, you may have noticed the very wide (like, 1 sd or more) average IQ gap between students in most fields which turned out to have terrible replication rates and most fields which turned out to have fine replication rates.
… mostly, though, the reason I believe the claim is from seeing how people in fact interact with research and decide to spread it.)
Two interesting implications of the median researcher problem:
- A small research community of unusually smart/competent/well-informed people can relatively-easily outperform a whole field, by having better internal memetic selection pressures.
- … and even when that does happen, the broader field will mostly not recognize it; the higher-quality memes within the small community are still not very fit in the broader field.
In particular, LessWrong sure seems like such a community. We have a user base with probably-unusually-high intelligence, community norms which require basically everyone to be familiar with statistics and economics, we have fuzzier community norms explicitly intended to avoid various forms of predictable stupidity, and we definitely have our own internal meme population. It’s exactly the sort of community which can potentially outperform whole large fields, because of the median researcher problem. On the other hand, that does not mean that those fields are going to recognize LessWrong as a thought-leader or whatever.
I agree, but there are two different perspectives:
From the first perspective, of course, if you want to be taken seriously, you need to play by their rules. And if you don't, then... those are your revealed preferences, I guess.
It is the second perspective I was concerned about. I agree that the outsiders are often wrong. But, consider the tweet you linked:
It seems to me that from the perspective of a researcher, taking ideas of the outsiders who have already developed successful products based on them, and examining them scientifically (and maybe rejecting them afterwards), should be a low-hanging fruit.
I am not suggesting to treat the ideas of the outsiders as scientific. I am suggesting to treat them as "hypotheses worth examining".
Refusing to even look at a hypothesis because it is not scientifically proven yet, that's putting the cart before the horse. Hypotheses are considered first, scientifically proved later; not the other way round. All scientific theories were non-scientific hypotheses first, at the moment they were conceived.
Choosing the right hypothesis to examine, is an art. Not a science yet; that is what it becomes after we examine it. In theory, any (falsifiable) hypothesis could be examined scientifically, and afterwards confirmed or rejected. In practice, testing completely random hypotheses would be a waste of time; they are 99.9999% likely to be wrong, and if you don't find at least one that is right, your scientific career is over. (You won't become famous by e.g. testing million random objects and scientifically confirming that none of them defies gravity. Well, you probably would become famous actually, but in the bad way.)
From the Bayesian perspective, what you need to do is test hypotheses that have a non-negligible prior probability of being correct. From the perspective of the truth-seeker, that's because both the success and the (more likely) failure contribute non-negligibly to our understanding of the world. From the perspective of a scientific career-seeker, because finding the correct one is the thing that is rewarded. The incentives are almost aligned here.
I think that the opinions of smart outsiders have maybe 10% probability of being right, which makes them hypotheses worth examining scientifically. (The exact number would depend on what kind of smart outsiders are we talking about here.) Even if 10% right is still 90% wrong. Why do I claim that 10% is a good deal? Because when you look at the published results (the actual "Science according to the checklist") that passed the p=0.05 threshold... and later half of them failed to replicate... then the math says that their prior probability was less than 10%.
(Technically, with prior probability 10%, and 95% chance of a wrong hypothesis being rejected, out of 1000 original hypotheses, 100 would be correct and published, 900 would be incorrect and 45 of them published. Which means, out of 145 published scientific findings, only about a third would fail to replicate.)
So we have a kind of motte-and-bailey situation here. The motte is that opinions of smart outsiders, no matter how popular, now matter how commercially successful, should not be treated as scientific. The bailey is that the serious researchers should not even consider them seriously as hypotheses; in other words that their prior probability is significantly lower than 10% (because hypotheses with prior probability about 10% are actually examined by serious researchers all the time).
And what I suggest here is that maybe the actual problem is not that the hypotheses of smart and successful outsiders are too unlikely, but rather that exploring hypotheses with 10% prior probability is a career-advancing move if those hypotheses originate within academia, but a career-destroying move if they originate outside of it. With the former, you get a 10% chance of successfully publishing a true result (plus a 5% chance of successfully publishing a false result), and 85% chance of being seen as a good scientist who just wasn't very successful so far. With the latter, you get a 90% chance of being seen as a crackpot.
Returning to Yann LeCun's tweet... if you invent some smart ideas outside of academia, and you build a successful product out of them, but the academia refuses to even look at them because the ideas are now coded as "non-scientific" and anyone who treats them seriously would lose their academic status... and therefore we will never have those ideas scientifically confirmed or rejected... that's not just a loss for you, for also for the science.