IAMINSTITUTE OF APPLIED MATHEMATICS

Using Ultra High Frequency Data for Integrated Variance Estimation: Gathering Evidence on Market Microstructure Noise

İnci Esen Kılıçkaya

Place: IAM S-211

Date / Time: 14.04.2017 / 10.00

Abstract. On the one hand, as a result of the more ready availability of ultra high frequency data (UHFD), realized volatility (RV) measures became popular in the finance literature since in theory, sampling at increasingly higher frequencies should lead to, in the limit, a consistent estimator of the integrated return volatility (IV) for Ito-semimartingale asset prices. On the other hand, when the observed prices are contaminated with an additive market microstructure noise (MMN), an asymptotic bias appears, and, therefore, it becomes necessary to mitigate the effect of MMN in the estimation of IV. The success of the available methods in the literature to suppress the MMN effects must be considered only if the empirical evidence backs the assumptions underlying the methods developed for handling the MMN. On this issue, we realize that the empirical evidence on the MMN structure should be collected taking into account the dimensions of volatility estimation using high frequency data as these dimensions may impair the validity of methods adopted to handle the MMN in the first place. Accordingly, in this thesis, first we provide a complete discussion of the dimensions of volatility estimation using UHFD, Next, we prove that the formal tests regarding the existence of MMN and the constant variance of MMN increments originally developed under calendar time sampling also can be used under transaction time sampling. Third, we propose a new approach to measuring the liquidity of stocks in a high frequency setting. Finally, by using tick data from Borsa İstanbul National Equity Market for a period of 6 months, we show that (i) the data handling procedures as various combinations of cleaning and aggregation methods do not distort UHFD’s original traits, (ii) the return dynamics in transaction time are different from those in calendar time, (iii) the RV dynamics are affected by the sampling scheme and liquidity but not by the data handling methods, (iv) volatility signature plots point to the existence of the MMN and suggest a positive relationship between the noise increment and the true price return, valid in all possible dimensions (sampling scheme, liquidity, data handling methods, and session-based or daily calculations), (v) MMN exhibits statistically significant existence under both CTS and TTS for all stocks, however, liquidity and data handling methods matter under TTS in terms of rejection rates of the null hypothesis that  MMN statistically does not exist, (vi) formal tests on the existence of MMN offer positive correlation between noise and efficient price, (vii) liquidity and sampling schemes are very influential on the rejection of the null hypothesis that the MMN increments have constant variance independent of the sampling frequency, in particular, under CTS, (assuming i.i.d MMN with constant variance is proper for frequencies lower than 1 min but under TTS, this assumption fails especially for liquid stocks), (viii) data handling has suppressive effects under TTS on the rejection percentages regarding the null hypothesis that the MMN increments have constant variance independent of sampling frequency.

 

Keywords: Integrated Variance, Realized Volatility, Market Microstructure Noise, Sampling Schemes, Data Handling Methods, Liquidity in High Frequency Finance


Stochastic Delay Differential Equations

E.Ezgi Aladağlı

Program of Financial Mathematics,

Advisor: Assoc.Prof.Dr. Yeliz Yolcu Okur
Co-advisor: Assist. Prof. Ceren Vardar Acar



Place: IAM S-212

Date / Time: 13.01.2017 / 13.45

Abstract.


Modern Portfolio Optimization with Value at Risk and Conditional Value at Risk - Explanation, Evaluation and Comparison

Sinem Keskin

Program of Financial Mathematics,

Advisor: Prof. Dr. Gerhard W. Weber



Place: IAM S-209

Date / Time: 06.01.2017 / 16.00

Abstract. 


Robust Conditional Value-at-Risk Under Parallelpipe Uncertainty: An Application to Portfolio Optimization

Güray Kara

Program of Financial Mathematics,

Advisor: Prof. Dr. Gerhard W. Weber

Place: IAM S-209

Date / Time: 21.12.2016 / 13.15

Abstract. 


Modeling Illiquidity Premium and Bid-Ask Prices of the Financial Securities

Azar Karimov

Program of Financial Mathematics,

Advisor: Prof. Dr. Gerhard W. Weber

Co-advisor: Prof. Dr. Suat Teker

Place: IAM S-208

Date / Time: 12.12.2016 / 11.30

Abstract. 


On The Efficiency Of Lattice-Based Cryptographic Signature Schemes On Graphical Processing Unit

Zaliha Yüce-Tok 

Program of Cryptography

Advisor: Prof. Dr. Ersan Akyıldız
Co-advisor: Dr.Sedat Akleylek

Place: IAM S-209

Date / Time: 05.12.2016 / 13.00

Abstract. 


Discrete-Time Surplus Process for Takaful Insurance with Multiple Threshold Levels

Arham Achlak

Program of Actuarial Sciences

Advisor:  Doç. Dr. A. Sevtap S. Kestel
Co-advisor:  Prof. Dr. Fatih Tank

Place: IAM S-209

Date / Time: 11.11.2016 / 10.00

Abstract. 

Sequence Families With Good Correlation Distribution
Eda Tekin
Program of  Cryptography

Advisor: Prof. Dr. Ferruh Özbudak

Place: Cryptology Lab.

Date / Time: 07.10.2016 / 10.40

Abstract. 


Analysis of Recent Attacks on SSL/TLS Protocols
Duygu Özden
Program of  Cryptography

Advisor: Assoc. Prof. Dr. Murat Cenk

Place: Cryptology Lab.

Date / Time: 09.09.2016 / 11.30

Abstract. 


An Analysis on Efficient Polynomial Multiplication Algorithms for Cryptographic Purposes
Murat Burhan İlter
Program of  Cryptography

Advisor: Assoc. Prof. Dr. Murat Cenk

Place: Cryptology Lab.

Date / Time: 09.09.2016 / 10.30

Abstract.