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by gulati
March 31st, 2006, 7:47 pm
Forum: Technical Forum
Topic: binomial tree with stochastic interest rates
Replies: 1
Views: 112062

binomial tree with stochastic interest rates

Check out this book -Implementing Derivatives ModelsLee Clewlow and Chris StricklandThey have pseudo-code as well.
by gulati
December 16th, 2005, 4:24 pm
Forum: Technical Forum
Topic: Negative Vega from Monis CB model
Replies: 17
Views: 129344

Negative Vega from Monis CB model

<t>MarcelWu,There is a bit of contradiction in your statement. Your first post says "if the underlying average stock price below/over some predetermined price for some time during some resetable period, the conversion price is reseted" whereas in the next post "there is no reset up of conersion pric...
by gulati
July 19th, 2005, 8:15 pm
Forum: Technical Forum
Topic: CDO delta calculation
Replies: 25
Views: 172022

CDO delta calculation

yes, it does. Delta is lower for the upfront payment.
by gulati
July 18th, 2005, 7:56 pm
Forum: Technical Forum
Topic: Hedging CDOs - Hull-White model - Probability Bucketing
Replies: 6
Views: 145822

Hedging CDOs - Hull-White model - Probability Bucketing

Refer to CDO delta calculation thread.
by gulati
July 18th, 2005, 7:49 pm
Forum: Technical Forum
Topic: CDO delta calculation
Replies: 25
Views: 172022

CDO delta calculation

Usually people shift by a fixed amount and not by %. if you shift by %, delta hedging is not same as "Duration Neutral" or hedging against parallel shift.
by gulati
July 1st, 2005, 1:57 pm
Forum: General Forum
Topic: Indices/Index Tranches Trading Strategies
Replies: 7
Views: 145569

Indices/Index Tranches Trading Strategies

daveangel,How can a delta hedged equity tranche have correlation convexity? You loose a lot of money when correlation goes down.-gulati
by gulati
April 4th, 2005, 6:30 pm
Forum: General Forum
Topic: CDO Tranche Delta - Compound Vs Base Correlation models
Replies: 9
Views: 160252

CDO Tranche Delta - Compound Vs Base Correlation models

Thanks, Soren. I also couldn't find any of these papers....do you know the gist of these papers?
by gulati
March 28th, 2005, 5:47 pm
Forum: Technical Forum
Topic: CDO Tranche Delta - Compound Vs Base Correlation models
Replies: 0
Views: 155360

CDO Tranche Delta - Compound Vs Base Correlation models

<t>Has anyone compared delta (or leverage) given by base correlation and compound correlation models? I am using standard 1 factor gaussian coppula model. I notice that compound correlation model's deltas are quite higher for mezz tranches (esp 5 year maturity) as compared to base correlation model'...
by gulati
March 21st, 2005, 4:03 pm
Forum: General Forum
Topic: CDO Tranche Delta - Compound Vs Base Correlation models
Replies: 9
Views: 160252

CDO Tranche Delta - Compound Vs Base Correlation models

Has anyone compared delta (or leverage) given by base correlation and compound correlation models? I am using standard 1 factor gaussian coppula model. I notice that compound correlation model's deltas are quite higher for mezz tranches as compared to base correlation model's. Any thoughts?
by gulati
March 4th, 2005, 8:55 pm
Forum: Technical Forum
Topic: CDO delta calculation
Replies: 25
Views: 172022

CDO delta calculation

<t>I am using C#. I implemented a part of the calculations in excel and I get exactly same (wrong) results as my program. So may be it is a floating point calculation issue with microsoft. Also, it works fine for the names with spreads close to the average. If a name has very high spread, I end up h...
by gulati
March 2nd, 2005, 10:02 pm
Forum: Technical Forum
Topic: CDO delta calculation
Replies: 25
Views: 172022

CDO delta calculation

<t>pj, thanks for your comments. Your point is valid that it is because of multiple equal and opposite operations (such as multiply and divide by same number which may be very large or small) but not becuase of repeated application of cummulative normal and its inverse. Cummulative normals are invol...
by gulati
February 11th, 2005, 10:45 pm
Forum: Technical Forum
Topic: CDO delta calculation
Replies: 25
Views: 172022

CDO delta calculation

<t>I am trying to implement Andersen's method (All your hedges in one basket) to calculate delta for each underlying name. So once the survival probabilities are calculated, one name can be removed and then added back in with 1 bp higher spread. This method of removing and adding names is numericall...