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  • 0 posts edited
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  • 31 votes cast
Apr
26
awarded  Commentator
Apr
26
comment Braess's paradox in quantitative finance: When optionality leads to lower value…?
Well the whole point of the braess paradox is that there are other participants and you have to anticipate their reactions to your choice.
Feb
11
comment Is Geometric Brownian Model suitable for long term price forecast?
I'd read up on Schiller's CAPE ratio.
Sep
24
awarded  Autobiographer
Dec
30
comment Switching from C++ to R - limitations/applications
Very complete answer!
Dec
29
comment Machine Learning on matlab 2010
How are your Matlab programs doing cross-validation on a time-series? You can't just do 10-fold CV (or whatever) as normal, since you shouldn't be training on future data and testing on past data.
Nov
25
comment Understanding the concept of Martingale pricing
"Many papers say that stock prices are best modeled using a geometric Brownian motion (GBM)" Actually I doubt many papers say this, as stock prices aren't best modeled with GBM.
Mar
18
comment Doesn't a perpetual option contradict the Black-Scholes framework?
@Alexey, I'm not sure I understand. Dynamically hedging the perpetual put would require shorting the stock for arbitrary lengths of time, would it not?
Mar
18
comment Doesn't a perpetual option contradict the Black-Scholes framework?
@Freddy, I didn't say that. I said "if".
Mar
16
awarded  Critic
Mar
16
comment Doesn't a perpetual option contradict the Black-Scholes framework?
That's my point though. If shorting stock for arbitrary lengths of time is not allowed, then how can you delta-hedge this perpetual option? And if you can't delta-hedge the option, how is the price you get under risk-neutral pricing argument the price?
Mar
15
awarded  Editor
Mar
15
revised Doesn't a perpetual option contradict the Black-Scholes framework?
update to clarify some issues
Mar
15
comment Doesn't a perpetual option contradict the Black-Scholes framework?
Freddy, yes, I'm aware it's a theoretical construct, and my question is a theoretical one. Is that not appropriate for this site? Also, please rest easy that I am occupying the bulk of my time with other thoughts. :)
Mar
14
awarded  Student
Mar
14
asked Doesn't a perpetual option contradict the Black-Scholes framework?
Nov
24
comment Why do ATM call options have a delta of slightly bigger than 0.5 and not 0.5 exactly?
Using r=0 is a great simplification that shows the real "culprit" behind the greater than 0.5 delta.
Nov
24
awarded  Teacher
Nov
24
awarded  Supporter
Nov
24
answered Monte carlo methods for vanilla european options and Ito's lemma.