Testing Weak Form Efficiency on the TSX. Stock Exchange
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1 Testing Weak Form Efficiency on the Toronto Stock Exchange V. Alexeev F. Tapon Department of Economics University of Guelph, Canada 15th International Conference Computing in Economics and Finance, Sydney 2009
2 Outline 1 Introduction Literature review Motivation 2 3 4
3 Literature review Motivation Market Efficiency Weak form market efficiency Fama (1970): a financial market is (informationally) efficient when market prices reflect all available information about value. The more efficient the market, the more random the sequence of price changes generated by such a market; and the most efficient market of all is a market in which price changes are completely random. Thus, if the number of patterns identified in the real price series is the same as in simulated price data, then technical analysis cannot be gainfully applied and the weak form of the efficient market hypothesis cannot be rejected.
4 Literature review Motivation Existing Literature Brock et al (1992) Model-based bootstrap 90-year sample period, DJIA ( ) 26 technical trading rules all outperformed the market. Lo et al (2000) Automated mechanical trading systems, chart pattern study. 35-year sample period, NYSE/AMEX/NASDAQ ( ). Several chart patterns do provide incremental information and may have some practical value.
5 Literature review Motivation Existing Literature Brock et al (1992) Model-based bootstrap 90-year sample period, DJIA ( ) 26 technical trading rules all outperformed the market. Lo et al (2000) Automated mechanical trading systems, chart pattern study. 35-year sample period, NYSE/AMEX/NASDAQ ( ). Several chart patterns do provide incremental information and may have some practical value.
6 Literature review Motivation Existing Literature Brock et al (1992) Model-based bootstrap 90-year sample period, DJIA ( ) 26 technical trading rules all outperformed the market. Lo et al (2000) Automated mechanical trading systems, chart pattern study. 35-year sample period, NYSE/AMEX/NASDAQ ( ). Several chart patterns do provide incremental information and may have some practical value.
7 Literature review Motivation Existing Literature Brock et al (1992) Model-based bootstrap 90-year sample period, DJIA ( ) 26 technical trading rules all outperformed the market. Lo et al (2000) Automated mechanical trading systems, chart pattern study. 35-year sample period, NYSE/AMEX/NASDAQ ( ). Several chart patterns do provide incremental information and may have some practical value.
8 Literature review Motivation Existing Literature Brock et al (1992) Model-based bootstrap 90-year sample period, DJIA ( ) 26 technical trading rules all outperformed the market. Lo et al (2000) Automated mechanical trading systems, chart pattern study. 35-year sample period, NYSE/AMEX/NASDAQ ( ). Several chart patterns do provide incremental information and may have some practical value.
9 Literature review Motivation Motivation In this study we: analyze each security listed on the TSX use several null models to simulate the data perform sector analysis of the TSX
10 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
11 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
12 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
13 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
14 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
15 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
16 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
17 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
18 outline Introduction 1 Smooth price series 2 Find local extrema points 3 Identify chart patterns 4 Use original return series to estimate model parameters 5 Using estimated parameters obtain simulated series 6 Repeat steps 1-3 for each simulated series 7 (original vs. simulated data) 8 Find proportion of securities with significantly higher occurrence of reversal patterns 9 Use total ranking techniques
19 original price series with natural cubic spline Suppose P it = f i (t) + ɛ it T i ˆf i (t) = arg min (P it f i (t)) 2 Ti + λ i f C 2 [1,T i ] t=1 1 ( ) 2dx f (x) (1) The smoothness of f i (.) is controlled through penalty function, λ i 0, acting as a smoothing parameter (or equivalently df) Optimal λ i obtained through CV, however, results in highly undersmoothed estimate.
20 original price series with natural cubic spline Suppose P it = f i (t) + ɛ it T i ˆf i (t) = arg min (P it f i (t)) 2 Ti + λ i f C 2 [1,T i ] t=1 1 ( ) 2dx f (x) (1) The smoothness of f i (.) is controlled through penalty function, λ i 0, acting as a smoothing parameter (or equivalently df) Optimal λ i obtained through CV, however, results in highly undersmoothed estimate.
21 original price series with natural cubic spline Suppose P it = f i (t) + ɛ it T i ˆf i (t) = arg min (P it f i (t)) 2 Ti + λ i f C 2 [1,T i ] t=1 1 ( ) 2dx f (x) (1) The smoothness of f i (.) is controlled through penalty function, λ i 0, acting as a smoothing parameter (or equivalently df) Optimal λ i obtained through CV, however, results in highly undersmoothed estimate.
22 Local Extrema Finding optimal smoothing parameter Lo et al (2000): used survey approach We rely on concavity of a functional relationship between number of patterns identified and a smoothing parameter (df)
23 Identification conditions based on five consecutive extrema points We search for ten reversal patterns e.g. Head-and-Shoulders (HS) reversal pattern E 1 > E 2 ensures E 1 is a local maximum E 3 > E 1 head is larger than left shoulder E 3 > E 5 head is larger than right shoulder E 1 E 5 (E 1 +E 5 )/2 C E 1 and E 5 are within C% of their average E 2 E 4 (E 2 +E 4 )/2 C E 2 and E 4 are within C% of their average E 3 E 1 ensures that the head of the pattern is S E 3 significantly larger than the shoulders
24 Identification conditions based on five consecutive extrema points We search for ten reversal patterns e.g. Head-and-Shoulders (HS) reversal pattern E 1 > E 2 ensures E 1 is a local maximum E 3 > E 1 head is larger than left shoulder E 3 > E 5 head is larger than right shoulder E 1 E 5 (E 1 +E 5 )/2 C E 1 and E 5 are within C% of their average E 2 E 4 (E 2 +E 4 )/2 C E 2 and E 4 are within C% of their average E 3 E 1 ensures that the head of the pattern is S E 3 significantly larger than the shoulders
25 s Commonly used models capturing specific data characteristics present in financial returns characteristics: leptokurtosis conditional heteroskedasticity moving average and autororrelation Sieve bootstrap Random walk with a drift EGARCH(p,q) ARMA(p,q) p,q chosen to minimize BIC and AICc respectively
26 s Commonly used models capturing specific data characteristics present in financial returns characteristics: leptokurtosis conditional heteroskedasticity moving average and autororrelation Sieve bootstrap Random walk with a drift EGARCH(p,q) ARMA(p,q) p,q chosen to minimize BIC and AICc respectively
27 s Commonly used models capturing specific data characteristics present in financial returns characteristics: leptokurtosis conditional heteroskedasticity moving average and autororrelation Sieve bootstrap Random walk with a drift EGARCH(p,q) ARMA(p,q) p,q chosen to minimize BIC and AICc respectively
28 s Commonly used models capturing specific data characteristics present in financial returns characteristics: leptokurtosis conditional heteroskedasticity moving average and autororrelation Sieve bootstrap Random walk with a drift EGARCH(p,q) ARMA(p,q) p,q chosen to minimize BIC and AICc respectively
29 Number of reversal patterns identified in original series vs simulated series Let M ij be a number of patterns identified for security i in simulation j let M i0 denote the number of patterns identified in the original price series The weak form efficient market hypothesis can then be stated as follows: H 0 : M i0 M i where M i = n j=0 M ij. H 1 : M i0 > M i
30 Number of reversal patterns identified in original series vs simulated series Let M ij be a number of patterns identified for security i in simulation j let M i0 denote the number of patterns identified in the original price series The weak form efficient market hypothesis can then be stated as follows: H 0 : M i0 M i where M i = n j=0 M ij. H 1 : M i0 > M i
31 Number of reversal patterns identified in original series vs simulated series Let M ij be a number of patterns identified for security i in simulation j let M i0 denote the number of patterns identified in the original price series The weak form efficient market hypothesis can then be stated as follows: H 0 : M i0 M i where M i = n j=0 M ij. H 1 : M i0 > M i
32 Occurrence of reversal patterns Proportion of securities with high occurrence of reversal patterns For a given set of securities (e.g market sectors) find proportion of these securities with significantly higher occurrence of patterns in original data than in simulated data.
33 Apply total ranking methods Introduction Use total ranking techniques to order sectors from highest to lowest in terms of proportion of stocks with significantly higher occurrence of patterns in original data than in simulated data
34 Dividend and split adjusted daily closing prices 1336 securities traded on Toronto Stock Exchange (on June 28, 2008) Subcategories: 38 market sectors S&P/TSX Composite index 9 ishares ETFs (XEG, XFN, XGP, XTR, XMA, XRE, XIT, XCG, XCV) Sample period: 25-year sample, from 1983(where available) to 2008
35 Dividend and split adjusted daily closing prices 1336 securities traded on Toronto Stock Exchange (on June 28, 2008) Subcategories: 38 market sectors S&P/TSX Composite index 9 ishares ETFs (XEG, XFN, XGP, XTR, XMA, XRE, XIT, XCG, XCV) Sample period: 25-year sample, from 1983(where available) to 2008
36 Dividend and split adjusted daily closing prices 1336 securities traded on Toronto Stock Exchange (on June 28, 2008) Subcategories: 38 market sectors S&P/TSX Composite index 9 ishares ETFs (XEG, XFN, XGP, XTR, XMA, XRE, XIT, XCG, XCV) Sample period: 25-year sample, from 1983(where available) to 2008
37 Dividend and split adjusted daily closing prices 1336 securities traded on Toronto Stock Exchange (on June 28, 2008) Subcategories: 38 market sectors S&P/TSX Composite index 9 ishares ETFs (XEG, XFN, XGP, XTR, XMA, XRE, XIT, XCG, XCV) Sample period: 25-year sample, from 1983(where available) to 2008
38 EGARCH(p,q) Proportions of securities with significantly large number of chart patterns
39 EGARCH(p,q) Total ranking report
40 EGARCH(p,q) Total ranking report
41 Some sectors appear to be more efficient than others Top ranked categories are comprised of largest and most frequently traded securities. Technical analysis will be potentially gainful in lower ranked sectors Outlook ARMA(p,q) presented controversial results Analysis of 5-year subsamples
42 Appendix For Further Reading For Further Reading I C. Park and S. Irwin The profitability of technical analysis: A review. AgMAS Project Research Report, 2004(04):1-102, W. Brock and J. Lakonishok and B. LeBaron Simple technical trading rules and the stochastic properties of stock returns. Journal of Finance, 47(5): , A. Lo and H. Mamaysky and J. Wang. Foundations of technical analysis: Computational algorithms, statistical inference, and empirical implementation. Journal of Finance, 55(5): , 2000.
Testing Weak Form Efficiency on the Toronto Stock Exchange
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