Stochastic Programming for Financial Applications
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1 Stochastic Programming for Financial Applications SAMSI Finance Group Project Adam Schmidt, Andrew Hutchens, Hannah Adams, Hao Wang, Nathan Miller, William Pfeiffer
2 Agenda Portfolio Optimization Our Formulation Our Results and Sensitivity Analysis Limitations and Future Work
3 Financial Portfolios A portfolio is a grouping of financial assets such as stocks, bonds and cash equivalents, as well as their funds counterparts, including mutual, exchange-traded and closed funds. - Investopedia
4 Modern Portfolio Theory Illustrates optimal behavior of a single investor Assumes investor is risk-averse Describes Expected Return-Variance of Returns Rule (EV Rule) Returns are maximized/risk is reduced through diversification Minimizing variance entails investing in stocks/securities with low covariance Efficient frontier Illustrates optimal portfolio & possible combos Highest expected returns for given risk Lowest risk for given expected return Limitations Investors will not be both rational and risk-averse Investors may not have the same information Investors don t understand what returns are possible
5 Our Conceptual Formulation
6 Risk The quantifiable likelihood of loss or less-than-expected returns Return increases with risk Variance and covariance can be used to define the risk of investing in stocks Minimize risk or maximize return?
7 Random Simulation
8
9 Random Simulation Efficient Frontier
10 Stochastic Programming can find the portfolios along the efficient frontier given a set of stocks. Random Portfolios Stochastic Program
11 Stochastic Program Mathematical Formulation
12 Stochastic Program Implementation in Python Data Collection a. Pandas, Datetime Packages b. Google Finance 2. Data Manipulation a. Calculated Average Daily Return b. Calculated Covariance Matrix c. Used Numpy 3. Optimization a. Quadratic Program in CVXOPT Package
13 Results - Risk/Return Matrix Optimized over three year period Jan Dec 2016 Stocks considered: Apple, Google, Facebook, Kellogg, Dr. Pepper Snapple Group, Kate Spade, Bank of America, Bed Bath and Beyond, Stryker Corp, Ebay, Rocket Fuel
14 Results On average... The risk of portfolio is decreasing with increasing number of stocks considered for the portfolio The risk of our portfolio is increasing with increasing minimum allowable return
15 A Review of Portfolio Success in 2017 (Jan-May) Portfolio of 11 different stocks Dr. Pepper Snapple Group, Google, Stryker Corp, Kellogg, Kate Spade, Facebook, Bank of America, Bed Bath and Beyond, Rocket Fuel, Ebay, Apple Portfolio 1 is least risky Portfolio 3 is most risky
16 Limitations of Our Work Do not determine the most optimal period to predict future portfolio success Only consider a maximum of 11 stocks May not define risk most optimally Model only uses past market data to predict future Dividends not considered
17 Future Work Determine a more accurate way to choose sample time period Which time period we should work on considering the economic environment How long the sample period should be, using the analysis of how well certain lengths of time have reflected the future in the past Measure the risk & return of the portfolio against appropriate benchmarks Improve the model by selecting stocks at random Random selection eliminates selection bias Add more constraints The weight on each stock could have a upper-limit Apply our portfolio method on other investing strategies Based on best stock combination, analyse how to decide the investment proportion
18 Future Work Value at Risk (VaR) VaR provides an estimate, under a given degree of confidence, of the size of a loss from a portfolio over a given time period We are 95% confident that we will lose no more than $10,000 in the next market day, or, we are 5% confident that we will lose at least $10,000 in the next market day It is possible to compute value at risk using a Monte Carlo Simulation - VaR will be the difference between current stock price and the estimated lowest terminal stock price If more time were available, many of these improvements could be implemented and fully tested in order to optimize our optimization method
19 Closing Remarks There are many methods one could implement in order to optimize a portfolio. The one we introduced is the method that we could devise, test, and analyze in the most complete way within the given time period. Thank you!
20 Questions? Contributors: Adam Schmidt; University of Wisconsin Andrew Hutchens; University of Central Florida Hannah Adams; University of North Carolina Hao Wang; Colorado State University Nathan Miller; Robert Morris University William Pfeiffer; Georgetown University Special Thanks: Peter Diao; SAMSI Post Doc
21 References Markowitz, Harry. Portfolio Selection. The Journal of Finance 7.1 (1952): JSTOR. Web. 16 May Efficient frontier. Investopedia. 3 August Web. 16 May Rowland, Ron, and Brian Campos. "Is Modern Portfolio Theory Out-of-Date." Investing, Forbes, 19 May 2010, Rowland, R., & Campos, B. (2010, May 19). Is Modern Portfolio Theory Out-of-Date. In Forbes. Accessed 18 May "Calculating VaR using Monte Carlo Simulation." Finance Train. N.p., 31 Aug Web. 18 May Halls-Moore, Michael. "QuantStart." Value at Risk (VaR) for Algorithmic Trading Risk Management - Part I - QuantStart. QuantStart, 7 July Web. 18 May "What Is An Investment Portfolio?" Money Choice. N.p., n.d. Web. 18 May "Basics of Investing, Financial Concepts." Basics of investing, Financial concepts, Risk return tradeoff. HSBC Global Asset Management, n.d. Web. 18 May 2017.
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