nhaliday + forum   62

About - Project Euler
I've written my program but should it take days to get to the answer?
Absolutely not! Each problem has been designed according to a "one-minute rule", which means that although it may take several hours to design a successful algorithm with more difficult problems, an efficient implementation will allow a solution to be obtained on a modestly powered computer in less than one minute.
math  rec-math  math.NT  math.CO  programming  oly  database  community  forum  stream  problem-solving  accretion  puzzles  contest  🖥  👳 
june 2019 by nhaliday
HN: the good parts
HN comments are terrible. On any topic I’m informed about, the vast majority of comments are pretty clearly wrong. Most of the time, there are zero comments from people who know anything about the topic and the top comment is reasonable sounding but totally incorrect. Additionally, many comments are gratuitously mean. You'll often hear mean comments backed up with something like "this is better than the other possibility, where everyone just pats each other on the back with comments like 'this is great'", as if being an asshole is some sort of talisman against empty platitudes. I've seen people push back against that; when pressed, people often say that it’s either impossible or inefficient to teach someone without being mean, as if telling someone that they're stupid somehow helps them learn. It's as if people learned how to explain things by watching Simon Cowell and can't comprehend the concept of an explanation that isn't littered with personal insults. Paul Graham has said, "Oh, you should never read Hacker News comments about anything you write”. Most of the negative things you hear about HN comments are true.

And yet, I haven’t found a public internet forum with better technical commentary. On topics I'm familiar with, while it's rare that a thread will have even a single comment that's well-informed, when those comments appear, they usually float to the top. On other forums, well-informed comments are either non-existent or get buried by reasonable sounding but totally wrong comments when they appear, and they appear even more rarely than on HN.


I compiled a very abbreviated list of comments I like because comments seem to get lost. If you write a blog post, people will refer it years later, but comments mostly disappear. I think that’s sad -- there’s a lot of great material on HN (and yes, even more not-so-great material).
hn  forum  subculture  list  contrarianism  community  dan-luu  top-n  🖥  techtariat 
october 2016 by nhaliday
LessWrong 2.0 - Less Wrong
The people still on the LW site are not a representative sample of anything. With the exception of a few people like Stuart Armstrong, they’re some kind of pack of unquiet spirits who have moved in to haunt it after it got abandoned by the founding community members. At this point it’s pretty much diaspora all the way down.
subculture  postmortem  rationality  forum  lesswrong  ratty  diaspora  schelling 
august 2016 by nhaliday
Links 10/15: Bride of Linkenstein | Slate Star Codex
Study predicts that US average IQ will rise 2-3 points in the next fifty years, driven by finding that minorities are catching up very quickly. Haven’t investigated their numbers yet, but excellent if true. [EDIT: more discussion here]

Omnilibrium is a social site that tries to improve online filtering. Instead of a big pot of Reddit-style karma that shows everyone the most upvoted posts, it tries to show everyone posts upvoted by people whose opinions have previously been correlated with theirs, with various customizable options to decide how much you want to be exposed to differing opinions. It needs more users for a good trial run, so check out their FAQ and then join in.

Female education decreases teenage fertility, but does not have a more general lifetime effect on fertility.

Michigan leads the nation in routing around democracy. The pessimistic view is that democracy shouldn’t be routed around. The optimistic view is that democracy should rarely be routed around, the catastrophes in Detroit and Flint are among those rare times, and this proves that people are good at limiting this extreme remedy to the times when it’s needed.

Chanda Chisala at Unz Report is on a roll. He’s been talking a lot about how the success of African immigrants to the US confounds a lot of simplistic explanations of the black-white achievement gap. Everybody figured this was just a result of those immigrants being heavily selected, but now he’s back with two posts arguing that it’s not selection effects. First, he points out that the immigrants’ children don’t seem to be regressing to the mean in a very specific Jensenian way that we would expect if they had been selected – this is more complex than I originally thought and not answered simply by “the offspring of two equally extreme parents will not regress”. Second, he points out that even the children of Somali refugees – an unselected population if ever there was one – seem to be doing better than native-born African-Americans. Some attempts at counterargument from James Thompson and Human Varieties. It’s good to see these issues being debated by such civil and mathematically sophisticated people, and also a sign of change how many people on both sides are black. Also by Chisala: book about Barack Obama debating Ayn Rand

Very large randomized controlled preschool study finds abysmal results of pre-K education; recipients of pre-K do better in kindergarten, but by third grade the trend reverses and they have worse behavioral and academic outcomes (hey, remember that study from last month how entering school too early may exacerbate ADHD)? This echoes results from the last few large randomized well-conducted preschool studies, so even the educational establishment is vaguely starting to notice a trend. James Heckman leads the pro-pre-K response, saying that past studies have found the same lack of advantage in later school performance but then later found better adult employment and prosociality outcomes; his explanation is that preschool doesn’t necessarily increase IQ but does increase “social and emotional skills that are greater determinants of late-life success”. But then how come the pre-K children had worse behavior in school in the new study? Possible explanation: the old studies Heckman cites were preschool plus a bunch of early life care and parenting help; maybe the latter helped and the former was at best neutral? Vox has a really excellent summary.
links  yvain  iq  politics  forum  race  education  usa  trends  ssc  ratty  multi  midwest  democracy  pop-diff  flynn  rindermann-thompson  prediction  regularizer  africa  migration  selection  albion  scitariat  regression-to-mean 
july 2016 by nhaliday
A Family-Friendly Policy That’s Friendliest to Male Professors - The New York Times
Evidence of a Toxic Environment for Women in Economics: https://www.nytimes.com/2017/08/18/upshot/evidence-of-a-toxic-environment-for-women-in-economics.html
lmao, Borjas:
Some economists say they find the discourse on econjobrumors.com to be a breath of fresh air. George Borjas, an economics professor at Harvard, wrote on his blog last summer that he found the forum “refreshing.”

Professor Borjas said: “There’s still hope for mankind when many of the posts written by a bunch of over-educated young social scientists illustrate a throwing off of the shackles of political correctness and reflect mundane concerns that more normal human beings share: prestige, sex, money, landing a job, sex, professional misconduct, sex … ” In an email sent on Wednesday, after he received a copy of Ms. Wu’s paper, Professor Borjas said his views have not changed.
academia  career  gender  study  economics  labor  news  higher-ed  data  summary  org:rec  multi  borjas  econotariat  lmao  sex  identity-politics  westminster  forum  community  chan  internet  commentary  media  propaganda 
june 2016 by nhaliday
Imzy - Home
reddit replacement w/ an agenda of friendliness
community  tools  software  social  forum  hmm 
april 2016 by nhaliday
poll-based comments - people write short disputable statements "Workers in Moscow don't make enough" and then other commenters can up or down-vote them, so that they can provide instant feedback without having to type anything
d3  community  forum  ai  organization 
august 2014 by nhaliday

bundles : interwebmeta

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