Serving the Quantitative Finance Community

Search found 11287 matches

by Alan
February 23rd, 2024, 7:14 pm
Forum: Brainteaser Forum
Topic: Picture says it all
Replies: 21
Views: 1723

Re: Picture says it all

That made me wonder -- can Copilot do captcha's? >> Here is another image question. There are nine images here.  >> Label them 1,2,3 (upper row), 4,5,6 (middle row), and 7,8,9 (bottom row). Using that labelling, which images contain a bus? 1_recaptcha_example.jpg Certainly! Let’s analyze the images ...
by Alan
February 23rd, 2024, 6:45 pm
Forum: Brainteaser Forum
Topic: Picture says it all
Replies: 21
Views: 1723

Re: Picture says it all

Obviously, kat got the answer. So, I just gave it to Copilot. (>> = me) >>  Can you answer a question about an image that I upload? Certainly! Please go ahead and upload the image, and I’ll do my best to assist you based on the content. >> What is the answer at the question mark (I upload image) Th...
by Alan
February 10th, 2024, 6:32 pm
Forum: Brainteaser Forum
Topic: Picture says it all
Replies: 21
Views: 1723

Picture says it all

problem.jpg
by Alan
February 10th, 2024, 4:50 pm
Forum: General Forum
Topic: Funds data
Replies: 2
Views: 425

Re: Funds data

I put it to MS Copilot (available in MS Edge): >> How can one find out the daily returns of mutual funds in the UK? --------------------------------------------------------------------------------------------------------------------------------------------------- To explore the **daily returns of mu...
by Alan
February 5th, 2024, 11:20 pm
Forum: General Forum
Topic: Probability that initial value of a discretely-observed 1D Brownian motion is a minimum or a maximum
Replies: 5
Views: 608

Re: Probability that initial value of a discretely-observed 1D Brownian motion is a minimum or a maximum

It's quite interesting, IMO, that the answer doesn't depend upon the distribution of the increments of the walk, as long it is continuous and symmetric. BTW, somewhat related: I did an article a while back for Wilmott magazine titled "Diffusions, Jumps, and the Distribution of the Maximum."...
by Alan
February 5th, 2024, 5:41 pm
Forum: General Forum
Topic: Probability that initial value of a discretely-observed 1D Brownian motion is a minimum or a maximum
Replies: 5
Views: 608

Re: Probability that initial value of a discretely-observed 1D Brownian motion is a minimum or a maximum

p.s. Perhaps this is answered by Corollary 5, here 

It agrees with your answer for N=2, which is apparently 3/8. 
by Alan
February 5th, 2024, 5:14 pm
Forum: General Forum
Topic: Probability that initial value of a discretely-observed 1D Brownian motion is a minimum or a maximum
Replies: 5
Views: 608

Re: Probability that initial value of a discretely-observed 1D Brownian motion is a minimum or a maximum

I would check out Feller, Vol. II Ch 12, or possibly Spitzer's 'Principles of Random Walk'.
by Alan
February 2nd, 2024, 5:15 pm
Forum: Student Forum
Topic: why we can't use linear regression to predict share prices?
Replies: 16
Views: 1100

Re: why we can't use linear regression to predict share prices?

Of course, kat is correct.  Since you are just learning regressions, try this. Create some simulated daily price data: [$] X_t = \mu + \sigma Z_t [$], where [$]X_t = \log P_t/P_{t-1}[$], so [$]P_t = P_{t-1} e^{X_t}[$]. Here [$]P_t[$] are the prices, [$]\mu = 0.10/252[$] is the daily log-return drift...
by Alan
February 1st, 2024, 7:57 pm
Forum: Book And Research Paper Forum
Topic: My Dinner with ChatGPT
Replies: 127
Views: 32610

Re: My Dinner with ChatGPT

party.png
by Alan
January 30th, 2024, 3:45 pm
Forum: Brainteaser Forum
Topic: Moving sofa problem
Replies: 13
Views: 1592

Re: Moving sofa problem

A friend of mine did research on these motion planning problems.

https://www.maths.tcd.ie/~odunlain/papers.html
It gets your attention nowadays when an article title has 'Retraction' in it.  :D 
by Alan
January 29th, 2024, 5:16 pm
Forum: Brainteaser Forum
Topic: Moving sofa problem
Replies: 13
Views: 1592

Re: Moving sofa problem

Soon AI will push you off your sofa! Solving olympiad geometry without human demonstrations | Nature If I ever sat for that, I would get the same score as ChatGPT -- 0! Next step for AI would be the Putnam Competition. Among physicists, I see Richard Feynman and Ken Wilson were both Putnam fellows ...
by Alan
January 25th, 2024, 11:16 pm
Forum: Student Forum
Topic: Do i need to know everything in time series to work in Quant?
Replies: 13
Views: 1630

Re: Do i need to know everything in time series to work in Quant?

Re the original question, it's good to have a "high level" picture, which is supplied by this gem:
A Guide to Econometrics -- Kennedy

From the 4th edition:
From_4th_edition20pct.jpg
by Alan
January 23rd, 2024, 6:04 pm
Forum: Politics Forum
Topic: Politicized science
Replies: 94
Views: 40676

Re: Politicized science

Haha -- that Tom Lehrer was great! Best laugh in weeks.

I see he is still around and a Harvard man!  :D
by Alan
January 23rd, 2024, 4:05 am
Forum: Politics Forum
Topic: Politicized science
Replies: 94
Views: 40676

Re: Politicized science

Yes, the article links to this blog
by Alan
January 22nd, 2024, 11:39 pm
Forum: Politics Forum
Topic: Politicized science
Replies: 94
Views: 40676

Re: Politicized science

Harvard is not having a good year:
Harvard Teaching Hospital Seeks Retraction of Six Papers by Top Researchers

(Slightly off-topic for this thread, but we don't have a good science/bad science thread)