Modeling Capital Market with Financial Signal Processing
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1 Modeling Capital Market with Financial Signal Processing Jenher Jeng Ph.D., Statistics, U.C. Berkeley Founder & CTO of Harmonic Financial Engineering,
2 Outline Theory and Techniques Theoretic Framework of Modeling Capital Markets: Index-Based Composition Methodology Statistical Procedure of Model Construction and Extension: Wavelets-Based Financial Signal Processing Technique Implications and Applications (ex. S&P 5) Measuring Market Uncertainty and Volatility Formatting Dynamic Strategies into Strategic Curves: Adaptive Futures Leveraging & Efficient Options Pricing Monitoring Impacts of Smart-Money Timing Strategies Gauging Cyclic Structure & Forecasting Market Crises Converging Patterns towards Market Crashes and Bubbles
3 Theoretic Framework of Modeling Capital Markets Index-Based Composition Methodology R i+1 = r i + Ψ(S i ) + Σ(S i ) ε i+1, ε i s i.i.d. ~ N(,1). Strategic Index S i = Γ(R i-l+1,, R i ) static regression dynamic auto-regression Non-stationary Correlation Noise barrier R i+1 = r i + µ(r i-l+1,, R i ) + σ(r i-l+1,, R i ) ε i+1, µ = Ψ Γ ; σ = Σ Γ Dimension Curse R i+1 : (i+1)-th periodical short-term market return rate - say, S&P 5 monthly; r i : i-th periodical average short-term interest rate - say, FFR monthly average; S i : i-th periodically updated strategic index value say, STTB Index, shown next
4 Mission Impossible to De-noise through Dimension Curse Piecewise (Monthly) Constant Geometric Brownian Motion dx t /X t = r i + µ i + σ i dw t, for t i-1 t <t i Key of Long-Term Consistent Profitability: Low-Frequency Component of Market Fluctuation Patterns about Interactions between µ i s and σ i s on Time-Domain Non-Stationarity & High-Frequency Noise-Barrier Knowledge in Ψ and Σ on S-Domain
5 Month.2 9/ / / / / / / Strategic Index Short-Term Trend Bias (STTB) Γ (non-parametric statistic) A Typical Series of Patterns for Illustrating the Point of STTB Bar Chart of 12-M RR Line-Joined Chart of 12-M RR STTB
6 Distribution of STTB
7 Gauging the Structure of a Market Cycle Monthly S TTB 12-Month S TTB Moving Average 12-Month S &P 5 Return Rate M. A. (% ) /1951 2/23 higher Red up, steeper Blue down; longer Red stays up, deeper Blue sinks down; vice versa
8 Consistently Leading the Cyclic Trend Monthly S TTB 12-Month S TTB Moving Average 12-Month S &P 5 Return Rate M. A. (% ) /1981 6/1985 Red Series (MA_STTB) is leading Blue Series in turnaround in a smooth conclusive way
9 The Fundamental Model Quantitative Psychological Model Parametric Model: Linear Heteroscedastic Parabolic Model R i+1 -r i = Ψ(S i ) + Σ(S i ) ε i+1, Ψ(S) = k (S-a) 2 +b; Σ(S) = c S+d, for 1 S<3. a Maximum Uncertainty Level: MLE = 2.92 b Uncertainty Aversion Rate: MLE = -.14 k Rational Confidence Coefficient: MLE =.17 c Stability Coefficient: MLE =.96 d Efficient Market Volatility: MLE =.23 *** MLE results are based on S&P 5 monthly data from 1/1951 to 2/23 *** Market Volatility = Dynamic (Low-Freq.: Uncertainty) + Stochastic (High-Freq.: Stability) Certainty Ψ Unstability Σ a STTB STTB
10 Basic Structure of Shaping Dynamic Investment Strategies over Domain of Strategic Index Strategic Curve Action Parameter (for Investment Decision-Making) Θ(S) shape of strategic curve goal of the strategy knowledge about the market Elementary Examples Strategic Index S (e.g. STTB) Future Leveraging Strategy maximizing cumulative return of a simple portfolio combining S&P 5 Stock Index Future and Cash (leverage-multiple of the total invested capital) Θ(S) =Ψ(S) / Σ 2 (S) Option Pricing Strategy fairly pricing the value of a One-Month At-The-Money Call contract (as a fraction of the current value of the underlying asset) Θ(S) = Φ[(r/Σ 2 +Ψ/Σ 2 +1/2) Σ] e -(r+ψ) Φ[(r/Σ 2 +Ψ/Σ 2-1/2) Σ]
11 Efficient Options Pricing Black-Scholes Model R i+1 = r i + µ + σ ε i+1 L.H.P. Composite Model R i+1 = r i + Ψ(S i ) + Σ(S i ) ε i+1 Expected Return = r + µ?; Volatility = σ? Predict Expected Return & Volatility by Interest Rate and STTB
12 Adaptive Leveraging Strategy for S&P 5 Future in comparison with one via model-free simulation maximizing cumulative return without risk control H i Empirical Raw Optimal Strategy Theoretical Raw Optimal Strategy Ψ/Σ 2 6 4? S i The Mystery of The Missing Bump?
13 The Complex extending knowledge beyond the psychological factor Complex Additive Model R i+1 = [Ψ(S i ) + (S i ) + Ω(S i )] + Σ(S i ) ε i+1, ε i s i.i.d. ~ N(,1). Psychological Factor Strategical Factor Rationality-Oriented, such as Uncertainty, Momentum Ψ, Smooth Curve Discipline-Oriented, such as Contrarian, Hedge Fund Arbitrage = + 1,, Concentrated Missing Bump Economical Factor Policy-Oriented, such as Short-Term Interest Rate (Feds Fund Rate) Ω(S i ) = r i + δ(s i ), δ, asymmetrically distributed
14 Nonparametric Decomposition to realize Model-Free Simulation distinguishing and recognizing factors moving the market Advanced Financial Signal Processing via Wavelet Technique Raw Financial Signal: R i+1 -r i = [Ψ(S i ) + (S i ) + δ(s i )] + Σ(S i ) ε i+1, i=1,, n R (%).1 W a ve le t M ulti-r e solutio n C om p one nts o f the F ina n c ia l S igna l Ψ,, δ, N Σ S, δ, N ,, δ, N on Daubechies 5 Basis on Haar Basis decomposition levels (log 2 n) with higher resolution are ignored almost nothing living there except for the components of the heteroscedastic white noise LHP C
15 Two-Peak Phenomenon
16 A Clue to the Remarkable Story of the Great Crash value of parameter a Month S TTB Moving Average 12-Month S &P 5 Return M.A. (% ) Max 2 Unc e rta inty Line 1-1 Feb 1986 Oct Nov 1981 Jul 1993
17 Similar Sign before Another Crash in Another Market
18 Striking Coincidence
19 Principle of Cyclic Hazard from the above two pre-crash patterns, it is intuitive to perceive the following principle: When the market s behavior eventually evolves into a rapid oscillation around the maximum uncertainty level rather than taking a typical cyclic course, the chance for the market to crash and the crash extent will increase day-by-day until that happens.
20 Bubble Phenomena: a dynamic picture for the principle of cyclic hazard Nikkei 225 S&P /85 12/9 4/96 4/1 as the cycles keep converging to, thus oscillating around, the maximum uncertainty level, accumulating fear of uncertainty builds up to end up with a market crisis
21 Underlying Mechanism for Principle of Cyclic Hazard Ping-Pong Hazard - a physical illustration with a pendulum
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