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by vixen
June 17th, 2010, 2:16 pm
Forum: Trading Forum
Topic: High Frequency Futures?
Replies: 6
Views: 30175

High Frequency Futures?

It seems that most high frequency trading is done in equities and FX. Do many people do HF futures trading strategies?
by vixen
September 17th, 2009, 2:52 pm
Forum: Off Topic
Topic: Best iPhone Apps
Replies: 13
Views: 35687

Best iPhone Apps

QuoteOriginally posted by: trackstarI am still in the BlackBerry camp myself, but if the iPhone offers Chess, that would be desirable.Plenty!My favourite at the moment is Shredder! Will try Fritz soon
by vixen
April 23rd, 2009, 8:21 am
Forum: Student Forum
Topic: state variables, Kalman filter
Replies: 5
Views: 40328

state variables, Kalman filter

Treat the constant c as an extra state variable. The state variable now becomes [x c], and G becomes [G 0;0 1] and the corresponding error term is zero.
by vixen
April 16th, 2009, 11:29 am
Forum: General Forum
Topic: Riddle for a quant...
Replies: 14
Views: 41817

Riddle for a quant...

Here is a counter-example:X = [ 1, 1, 1, 2, 2, 2, 2, 2, 2, 5 ]min = 1max = 5mean = 2median = 2std = 1.1547 < 1.3038 Edit: Damn Matlab!! std(X) = 1.1547 and std(X,1) = 1.0954. The difference being whether we divide by N or N-1.
by vixen
January 23rd, 2009, 11:09 am
Forum: General Forum
Topic: RBS
Replies: 69
Views: 52731

RBS

Deceptive! It confounds linear scale with area.
by vixen
December 16th, 2008, 4:49 pm
Forum: Brainteaser Forum
Topic: WHY
Replies: 9
Views: 46388

WHY

Yup. Misunderstanding. But I do agree with you that 'why' is the most confused and abuse of them all., what with the teleological, mechanistic, and intentional types of answers possible to such a question. If only we had separate words to represent each type of question.
by vixen
December 16th, 2008, 4:13 pm
Forum: Brainteaser Forum
Topic: WHY
Replies: 9
Views: 46388

WHY

QuoteOriginally posted by: quantystQuoteOriginally posted by: vixenWTF?Why the attitude?Why are you bothered by the question?Chill dude. Twas only a joke. I was trying to succinctly point out the other three letter interrogative that is now the accepted form for expressing confusion.
by vixen
December 16th, 2008, 8:27 am
Forum: Brainteaser Forum
Topic: WHY
Replies: 9
Views: 46388

WHY

WTF?
by vixen
August 29th, 2008, 11:40 pm
Forum: Brainteaser Forum
Topic: Cute Cube Colored
Replies: 17
Views: 51851

Cute Cube Colored

I think it should be the permutation of the 'faces' divided by the order of the rotation group of the n-cube.
by vixen
July 23rd, 2008, 11:40 am
Forum: Brainteaser Forum
Topic: A Different Identical Twins But Different Puzzle!
Replies: 26
Views: 56573

A Different Identical Twins But Different Puzzle!

You could do it by floating it in liquids of various densities and noting the depth below the surface.
by vixen
July 16th, 2008, 1:31 pm
Forum: Brainteaser Forum
Topic: Least Time ... This One!
Replies: 14
Views: 53048

Least Time ... This One!

Is it not independent of the slope, as long as it intersects the semi-circle?
by vixen
July 15th, 2008, 3:54 pm
Forum: Brainteaser Forum
Topic: Least Time of Descent
Replies: 17
Views: 54149

Least Time of Descent

Surely, it should be independent of h, no? I get
by vixen
July 9th, 2008, 10:20 am
Forum: Brainteaser Forum
Topic: May The Calc Be With You!
Replies: 3
Views: 52090

May The Calc Be With You!

by vixen
July 8th, 2008, 1:41 pm
Forum: Brainteaser Forum
Topic: Stole It From The Net!
Replies: 5
Views: 52411

Stole It From The Net!

P(n) ~ n^(-1/2) ... so tends to 0.
by vixen
July 7th, 2008, 3:38 pm
Forum: Brainteaser Forum
Topic: Point Lost In A Polygon
Replies: 26
Views: 54856

Point Lost In A Polygon

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