Hacker News: crasshopper

New comment by crasshopper in "The Bullshit Web"

crasshopper — Wed, 01 Aug 2018 02:40:43 +0000

browse in w3m. problem solved.

New comment by crasshopper in "Random Points on a Sphere"

crasshopper — Wed, 11 Jul 2018 10:49:56 +0000

Persi Diaconis https://www.ams.org/notices/200511/what-is.pdf — you want to choose randomly from the eigenvalues of a matrix

New comment by crasshopper in "Random Points on a Sphere"

crasshopper — Wed, 11 Jul 2018 10:48:39 +0000

read his post on octonions http://math.ucr.edu/home/baez/octonions/

The 1, 2, 4, 8 phenomenon surprised 20th-century mathematicians, and derives from weird facts about how S7, S3, and S1 fiber. (fibration is lining one shape with other shapes)

New comment by crasshopper in "Random Points on a Sphere"

crasshopper — Wed, 11 Jul 2018 10:47:22 +0000

Persi Diaconis https://www.ams.org/notices/200511/what-is.pdf

Niles Johnson on Hopf/Milnor fibrations https://nilesjohnson.net/hopf.html

New comment by crasshopper in "The sequence 1 1 ∞ 5 6 3 3 3"

crasshopper — Fri, 24 Nov 2017 05:05:00 +0000

For those who want to know more, this topic links nicely into A-D-E theory, Dynkin diagrams, and Coxeter groups.

https://www.youtube.com/playlist?list=PL-XzhVrXIVeSVcV9iRJ4S...

https://www.youtube.com/playlist?list=PL-XzhVrXIVeQ298S6uCyo...

http://math.ucr.edu/home/baez/week230.html

https://unapologetic.wordpress.com/category/geometry/root-sy...

http://www.math.harvard.edu/~lurie/papers/thesis.pdf

Beautiful world this author is peeking into. Enjoy.

New comment by crasshopper in "Autopsy: Lessons from Failed Startups"

crasshopper — Fri, 05 Jun 2015 19:17:09 +0000

Yeah, but is a vote-system going to be better?

New comment by crasshopper in "Autopsy: Lessons from Failed Startups"

crasshopper — Fri, 05 Jun 2015 19:15:52 +0000

Thanks for doing this! I hope more people add their stories.

New comment by crasshopper in "Hacking thoughts, literally"

crasshopper — Fri, 05 Jun 2015 19:04:37 +0000

Seems more like "electrophysiology" than "a neuroscience revolution". Would be really cool to have played around with those in school though.

An R package for Bayesian causal inference on time-series

crasshopper — Tue, 27 Jan 2015 22:57:00 +0000

Article URL: http://google.github.io/CausalImpact/CausalImpact.html

Comments URL: https://news.ycombinator.com/item?id=8956732

Points: 1

# Comments: 0

Which Bootstrap When? (2013) [pdf]

crasshopper — Tue, 27 Jan 2015 22:55:53 +0000

Article URL: http://www.stat.cmu.edu/~cshalizi/uADA/13/lectures/which-bootstrap-when.pdf

Comments URL: https://news.ycombinator.com/item?id=8956718

Points: 11

# Comments: 1

New comment by crasshopper in "The Mind of a Con Man (2013)"

crasshopper — Mon, 12 Jan 2015 18:43:45 +0000

I wonder why the graduate students went to Zeelenberg first, instead of straight to Eijlander.

Use weighted averages to sort your products

crasshopper — Tue, 23 Sep 2014 19:28:58 +0000

Article URL: http://isomorphism.es/post/98244572999/covectors-are-weighted-averages

Comments URL: https://news.ycombinator.com/item?id=8357611

Points: 1

# Comments: 0

New comment by crasshopper in "What We Do and Don't Know about Software Development Effort Estimation"

crasshopper — Tue, 02 Sep 2014 07:04:38 +0000

I've heard that as well. I dunno, doubling seems to have worked so far...

New comment by crasshopper in "What We Do and Don't Know about Software Development Effort Estimation"

crasshopper — Sun, 31 Aug 2014 00:47:37 +0000

Agreed, if you're doing the same kind of work (or similar enough) over time.

New comment by crasshopper in "What We Do and Don't Know about Software Development Effort Estimation"

crasshopper — Sat, 30 Aug 2014 22:46:00 +0000

   Hofstadter's Law: It always takes longer than you expect,
   even when you take into account Hofstadter's Law.

The best advice I ever got on project-time estimation (from a biology postdoc) was: make your best, most honest best effort, and then double it.

When I make projections with a spreadsheet, I have a cell that copies my grand total of all costs and call that copy "unforeseen costs". I always hate bidding that high at the start, but the estimate ends up being close to right surprisingly often.

This article says 30% overruns are common, which is within my former boss' +100% bounds.

The other nice thing about doubling your cost estimate is it prevents you from catching the winner's curse and landing an overly-stingy client. Plus if you really can keep costs within your spec for the project, then you win extra profits. You'll never win that "game" if you don't leave room for error.

New comment by crasshopper in "What We Do and Don't Know about Software Development Effort Estimation"

crasshopper — Sat, 30 Aug 2014 22:39:19 +0000

If, as the article says, "Clients’ Focus on Low Price Is a Major Reason for Effort Overruns", then probably a simpler theoretical explanation can just be the winner's curse.

No need to talk about distributions, gaussian or otherwise.

New comment by crasshopper in "Ask HN: What's your favorite command-line tool for working with data?"

crasshopper — Wed, 13 Aug 2014 22:05:03 +0000

And Seth Brown wrote a few useful small functions too.

http://www.drbunsen.org/explorations-in-unix/

(might have also made it to HN)

New comment by crasshopper in "Ask HN: What's your favorite command-line tool for working with data?"

crasshopper — Wed, 13 Aug 2014 21:19:31 +0000

Here's a tiny tool I like: https://gist.github.com/isomorphisms/9537586

It just prints the first `head` line and then random few rows instead of the top few. For me this is nicer than looking at the top 5 lines every time. I'm peeping at different parts of the table and thus gradually getting acquainted with it.

New comment by crasshopper in "Ask HN: What's your favorite command-line tool for working with data?"

crasshopper — Wed, 13 Aug 2014 18:50:34 +0000

Jeroen, I'm just reading your [1] for the first time now. Are you aware of Dirk Eddelbuettel's `littler`? I believe that might overlap with your Rio tool to some degree.

Information entropy and the labour market

crasshopper — Sat, 09 Aug 2014 21:21:43 +0000

Article URL: http://isomorphism.es/post/62275029841/entropy-and-the-labour-market

Comments URL: https://news.ycombinator.com/item?id=8158048

Points: 4

# Comments: 0