Delta-Hedging Correlation Risk?
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1 ISFA, Université Lyon 1 International Finance Conference 6 - Tunisia Hammamet, March 2011
2 Introduction, Stéphane Crépey and Yu Hang Kan (2010)
3 Introduction Performance analysis of alternative hedging strategies developed for the correlation market CDO tranches on standard Index such as CDX North America Investment Grade index 100% CDX North America Main 125 CDS, Investment Grade Second Super Senior First Super Senior Senior Senior Mezzanine Junior Mezzanine Equity 30% 15% 10% 7% 3% 0% Spreads, level of subordination
4 Introduction Several risks at hand which may sometimes overlap: Default risk of reference entities Cash-flows of synthetic CDO tranches are driven by the evolution of the portfolio loss Correlation risk L t = 1 n (1 R i)1 {τi t} n i=1 Credit spread risk or Market risk Evolution of market prices after inception Contagion risk Dynamic combination of credit spread risk and default risk
5 Hedging loss derivatives In this study,... We want to hedge of a buy protection position on an index CDO tranche Hedging instruments are : CDS Index Savings account Performance analysis of alternative hedging methods: Gauss : delta of the tranche computed within the one-factor Gaussian copula model (industry-standard quotation device) lo : delta of the tranche computed within the local intensity model (two specifications of model parameters)
6 Hedging loss derivatives Gauss delta: Gauss t = V(t, St + ε, ρt) V(t, St, ρt) V I (t, S t + ε) V I (t, S t) V: price of the tranche computed in the Gaussian copula model V I : price of the CDX index computed in the Gaussian copula model S t: credit spread of the CDS index at time t ε = 1 bp ρ t: implied correlation parameter of the tranche at time t Gauss delta = Sensitivity with respect to the CDS Index spread using the industry standard quotation device
7 Hedging loss derivatives Local intensity delta: lo V (t, Nt + 1) V (t, Nt) t = V I (t, N t + 1) V I (t, N. t) V : price of the tranche computed in the local intensity model V I : price of the CDX index computed in the local intensity model N t: current number of defaults Local intensity delta = Jump-to-Default delta computed using the local intensity model
8 Local intensity model Parallels the Dupire s local volatility approach developed for the equity derivative market The number of defaults N t is modeled as a continuous-time Markov chain (pure birth process) with generator matrix: Λ(t) = λ(t, 0) λ(t, 0) λ(t, 1) λ(t, 1) λ(t, n 1) λ(t, n 1) λ(t, k), k = 0,..., n 1 : state-dependent default intensities Model involves as many parameters as the number of names
9 Local intensity model Binomial tree: discrete version of the local intensity model λ(t,0) λ(t, 0) λ(t,1) λ(t,1) 0 Λ(t)= λ(t,n 1) λ(t,n 1) k λ(t, k) 1-λ(t, k) k+1 k λ(t+1,k+1) 1 λ(t+1,k+1) λ(t+1,k) 1-λ(t+1,k) k+2 k+1 k Given some loss intensities λ(t, k), CDO tranches and index prices computed by backward induction: λ(t+1,k+1) k+2 V(t+2,k+2) V I (t+2,k+2) k λ(t, k) 1-λ(t, k) k+1 k 1 λ(t+1,k+1) λ(t+1,k) 1-λ(t+1,k) k+1 k V(t+1,k+1) V I (t+1,k+1) V(t+1,k) V I (t+1,k) V(t+2,k+1) V I (t+2,k+1) V(t+2,k) V I (t+2,k)
10 Data set 5-year CDX NA IG Series 5 from 20 September 2005 to 20 March year CDX NA IG Series 9 from 20 September 2007 to 20 March year CDX NA IG Series 10 from 21 March 2008 to 20 September CDX5 CDX9 CDX10 Index spreads Index spread Base correlation at 3% strike CDX5 CDX9 CDX10 Base correlation at 3% strike bps Observation day Observation day
11 Model Specifications Gauss: Gaussian copula model with one implied correlation parameter per standard tranche (base correlation approach) Para: Local intensity model parametric specification of local itensities (Herbertsson (2008)) λ(t, k) = λ(k) = (n k) EM: Local intensity model local itensities λ(t, k) obtained by minimizing a relative entropy distance with respect to a prior distribution [ ( )] inf Q Λ EQ 0 dq dq ln dq 0 dq 0 (Cont and Minca (2008)) k i=0 b i
12 Empirical results Root mean squared calibration errors (in percentage): CDX5 CDX9 CDX10 Tranche Gauss Para EM Gauss Para EM Gauss Para EM Index %-3% %-7% %-10% %-15% %-30% Comparison of typical shapes of local intensities λ(t, k), Para (left), EM (right)
13 Calibration results Comparison of three alternative hedging methods Gauss delta: index Spread sensitivity computed in a one-factor Gaussian copula model Gauss V(t, St + ε, ρt) V(t, St, ρt) t = V I (t, S t + ε) V I (t, S t) where V and V I are the Gaussian copula pricing function associated with (resp.) the tranche and the CDS index. Local intensity delta: lo V (t, Nt + 1) V (t, Nt) t = V I (t, N t + 1) V I (t, N. t) with both Parametric (Para) and Entropy Minimisation (EM) calibration methods Credit deltas on 20 September 2007 (normalized to tranche notional) Tranche Gauss Para EM 0%-3% %-7% %-10% %-15% %-30%
14 Empirical results Time series of equity tranche credit deltas, CDX.NA.IG series 5, 9 and Gauss Para EM Tranche [0%,3%] deltas CDX Tranche [0%,3%] deltas CDX9 Gauss Para EM Oct05 Dec05 Feb Tranche [0%,3%] deltas CDX10 0 Apr08 Jun08 Aug08 0 Oct07 Dec07 Feb08 Gauss Para EM
15 Hedging performance Back-testing hedging experiments on series 5, 9 and 10 Hedging portfolio rebalanced everyday (dt=1) P&L (Profit-and-Loss) increment of hedged position: δp &L(t) = δv m(t) t δv I m(t) δv m(t) = V m(t + dt) V m(t): realized increment of tranche price δvm(t) I = Vm(t I + dt) Vm(t): I realized increment of index price t: One of the previous hedging ratios computed at time t P&L increments evaluated in the same frequency as rebalancing
16 Hedging performance Two metrics to compare the hedging strategies: Relative hedging error = = Average P&L increment of the hedged position Average P&L increment of the unhedged position Average of δp &L(t) Average of δv m(t) Residual volatility = = P&L increment volatility of the hedged position P&L increment volatility of the unhedged position Volatility of δp &L(t) Volatility of δv m(t)
17 Hedging performance for 1-day rebalancing Relative hedging errors (in percentage) CDX5 CDX9 CDX10 Tranche Li Para EM Li Para EM Li Para EM 0%-3% %-7% %-10% %-15% %-30% Residual volatilities (in percentage) CDX5 CDX9 CDX10 Tranche Gauss Para EM Gauss Para EM Gauss Para EM 0%-3% %-7% %-10% %-15% %-30%
18 Conclusion All model specifications perfectly fit CDO tranche quotes However, for the local intensity model, the two introduced specifications give strikingly different deltas and dramatically different hedging performances Hedging based on local intensity model with Entropy Minimisation calibration gives poor performance Before the crisis (CDX5), Gauss delta outperforms local intensity deltas During the crisis (CDX9 & CDX10), no clear evidence to discriminate between Gauss delta and Para local intensity delta
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