Multi-Factor Polynomial Diffusion Models and Inter-Temporal Futures Dynamics

ArXiv ID: 2409.19386 “View on arXiv”

Authors: Unknown

Abstract

In stochastic multi-factor commodity models, it is often the case that futures prices are explained by two latent state variables which represent the short and long term stochastic factors. In this work, we develop the family of stochastic models using polynomial diffusion to obtain the unobservable spot price to be used for modelling futures curve dynamics. The polynomial family of diffusion models allows one to incorporate a variety of non-linear, higher-order effects, into a multi-factor stochastic model, which is a generalisation of Schwartz and Smith (2000) two-factor model. Two filtering methods are used for the parameter and the latent factor estimation to address the non-linearity. We provide a comparative analysis of the performance of the estimation procedures. We discuss the parameter identification problem present in the polynomial diffusion case, regardless, the futures prices can still be estimated accurately. Moreover, we study the effects of different methods of calculating matrix exponential in the polynomial diffusion model. As the polynomial order increases, accurately and efficiently approximating the high-dimensional matrix exponential becomes essential in the polynomial diffusion model.

Keywords: polynomial diffusion, Schwartz-Smith model, Kalman filter, futures curve dynamics, matrix exponential, commodities

Complexity vs Empirical Score

• Math Complexity: 9.0/10
• Empirical Rigor: 4.0/10
• Quadrant: Lab Rats
• Why: The paper is highly mathematical, involving polynomial diffusion models, matrix exponentials, and advanced filtering techniques (EKF, UKF), requiring dense theoretical derivation. It lacks real backtesting or performance metrics, focusing instead on simulation studies and theoretical discussions on parameter identification.

  flowchart TD
    A["Research Goal: Extend Schwartz-Smith model<br>using Polynomial Diffusion for futures dynamics"] --> B{"Methodology"};
    B --> C["Estimate Parameters & Latent Factors<br>via Kalman Filtering"];
    B --> D["Compute Matrix Exponential<br>for High-Dimensional States"];
    C --> E["Comparative Analysis of<br>Estimation Procedures"];
    D --> E;
    E --> F{"Key Findings/Outcomes"};
    F --> G["Futures prices estimated accurately<br>despite polynomial parameter identification issues"];
    F --> H["Matrix exponential efficiency crucial<br>for high polynomial orders"];