Supervisor, Prof. Ph.D. Moisă ALTĂR. MSc. Student, Octavian ALEXANDRU
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1 Supervisor, Prof. Ph.D. Moisă ALTĂR MSc. Student, Octavian ALEXANDRU
2 Presentation structure Purpose of the paper Literature review Price simulations methodology Shock detection methodology Data description Results and interpretations Conclusion and references
3 Purpose of the paper The aim of this paper is to find out whether there exists confirmation bias leading to one of the most well known price patterns in technical analysis head and shoulders. Efficient markets Confirmation bias Market overreaction Market prices reflect all current and past publicly available information. Returns in excess of average market returns on a risk-adjusted basis cannot be achieved. The tendency of traders to favor information that confirms their beliefs and disregard the other. Hypothesis assuming that people react disproportionately to news regarding their assets, followed by an adjustment to the true value.
4 Literature review
5 Price simulations methodology In order to have a price series from where to extract price jumps, we simulated a stochastic volatility jump-diffusion process by using the following equations: dp t = μdt + σ t dw 1t + J t dq t dσ t 2 = β θ σ t 2 dt + γ σ t 2 dw 2t 1-second tick size 6.5 trading hours per day Jump timing is exponentially distributed Jump size is distributed normally
6 Shock detection methodology RV t m j=1 2 r t,j t 2 σ s t 1 Calculate realized variance and bi-power variation: t 2 ds + J s t 1 dq s BV t π m 2 m 1 m j=2 r t,j t 2 r t,j 1 σ s t 1 ds Calculate the RJ t = RV t BV t RV t ratio and scale it to a standard normal distribution. ZJ t RJ t π π 5 1 m max 1, TP t BV t 2 N(0,1) Use the predetermined α significance level for the scaled RJ t and calculate the price jumps by: J t = sign(r t ) (RV t BV t ) 1 (ZJt F α 1 )
7 Data description
8 Intermediary results EUR/USD Mean Min Max Stdev Realized variance (RV) Sqrt of realized variance Realized bi-power variance (BV) BV/RV RJ = (RV-BV)/RV ZJ = Scaled (normalized) RJ XAU/USD Mean Min Max Stdev Realized variance (RV) Sqrt of realized variance Realized bi-power variance (BV) BV/RV RJ = (RV-BV)/RV ZJ = Scaled (normalized) RJ
9 Jump properties EUR/USD Mean Min Max Stdev Jump frequency Jump size Abs. shock size Abs. daily return* Jump variance Total variance* XAU/USD Mean Min Max Stdev Jump frequency Jump size Abs. jump size Abs. daily return* Jump variance Total variance* *Values are calculated for days with shocks only.
10 Jump properties for days with high volatility EUR/USD Mean Min Max Stdev Jump frequency Jump size Abs. jump size Abs. daily return Jump variance Total variance XAU/USD Mean Min Max Stdev Jump frequency Jump size Abs. jump size Abs. daily return Jump variance Total variance
11 Variance decomposition 8% AUD/USD 5% EUR/USD USD/JPY 10% 6% XAG/USD 92% 95% 90% 94% Jumps risk 7% XAU/USD 6% GBP/USD 6% USD/CHF 6% USD/CHF Continuous risk 93% 94% 94% 94%
12 Histograms and normality EUR/USD Mean Median Maximum Minimum Std. Dev Skewness Kurtosis Jarque-Bera Probability Obs XAU/USD Mean Median Maximum Minimum Std. Dev Skewness Kurtosis Jarque-Bera Probability Obs
13 Jump autocorrelations EUR/USD all days XAU/USD all days Lag Autocorrelation Q-Stat Probability EUR/USD high volatility days Lag Autocorrelation Q-Stat Probability XAU/USD high volatility days Lag Autocorrelation Q-Stat Probability Lag Autocorrelation Q-Stat Probability
14 9 th and 10 th decile autocorrelations By selecting the 20% largest shocks according to their absolute jump size for all currency pairs and studying their correlation with the next 3 shocks that followed, we found out the following: Correlation matrix Jump t Jump t+1 Jump t+2 Jump t+3 Jump t Jump t Jump t Jump t+3 1 Ljung-Box Statistic p-value
15 All-shocks autocorrelations We tested the autocorrelation of all the 1638 detected jumps aggregated into a single series, thus achieving a superior statistical significance, but lower correlation values. Correlation matrix Jump t Jump t+1 Jump t+2 Jump t+3 Jump t Jump t Jump t Jump t+3 1 Ljung-Box Statistic p-value
16 Conclusion Significant price jumps in FX markets appear on average once every 5 days, and just as often during high volatility days. Price jumps account for 5% to 10% of the total variance, have a mean equal to zero and account for a large part of the day s return. Jumps have an overall negative autocorrelation, although no pair by itself revealed results statistically significant at a 5% level. Confirmation bias could not be confirmed by the results. Actually, calculations were leading more to the market overreaction hypothesis.
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20 References Barndorff-Nielsen, O., Shephard, N., Power and bi-power variation with stochastic volatility and jumps. Journal of Financial Econometrics 2, Dunham, L., Friesen, G., An empirical examination of jump risk in US equity and bond markets. North American Actuarial Journal 11, Friesen, G., Weller, P., Dunham, L., Price trends and patterns in technical analysis: A theoretical and empirical examination. Journal of Banking & Finance 33 (2009) Huang, X., Tauchen, G., The relative contribution of jumps to total price variance. Journal of Financial Econometrics 3, Tauchen, G., Zhou, H., Realized jumps on financial markets and predicting credit spreads. Finance and Economics Discussion Series , Board of Governors of the Federal Reserve System. Daniel, K., Hirshleifer, D., Subrahmanyam, A., Investor psychology and security market under- and overreactions. The Journal of Finance vol. LIII, no. 6,
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