scholarly journals ESTIMATION OF TIME-VARYING ADJUSTED PROBABILITY OF INFORMED TRADING AND PROBABILITY OF SYMMETRIC ORDER-FLOW SHOCK

2012 ◽  
Vol 28 (7) ◽  
pp. 1138-1152 ◽  
Author(s):  
Daniel Preve ◽  
Yiu-Kuen Tse
Keyword(s):  
Informed Trading ◽  
Time Varying ◽  
Order Flow ◽  
Probability Of Informed Trading ◽  
Estimation Of Time

Measuring the Toxicity of Order Flow using High Frequency Data: The Case of KOSPI200 Index Futures

2014 ◽  
Vol 22 (1) ◽  
pp. 117-139
Author(s):  
Ki Yool Ohk ◽  
Ming Wu
Keyword(s):  
High Frequency ◽  
Futures Market ◽  
Informed Trading ◽  
Market Volatility ◽  
High Frequency Data ◽  
Order Flow ◽  
Frequency Data ◽  
Conditional Probability Distribution ◽  
Index Futures ◽  
Probability Of Informed Trading

This study presents a new informed trading probability measure VPIN (Volume-Synchronized Probability of Informed Trading) to estimate toxic order flow of KOSPI200 index futures in a high frequency world. This measure does not require to estimate non-observable parameters as PIN. Also, it is estimated based on volume time, so it can estimate toxicity of order flow in a high frequency world. We show a relation between KOSPI200 index futures VPIN and futures market volatility using correlation and conditional probability distribution. A main empirical result is that persistently high VPIN signifies a high risk of subsequent large futures market volatility. It means that VPIN is a useful measure to estimate a toxicity induced volatility.

Observer-Based Fault Diagnosis of Satellite Systems Subject to Time-Varying Thruster Faults

2006 ◽  
Vol 129 (3) ◽  
pp. 352-356 ◽  
Author(s):  
Wen Chen ◽  
Mehrdad Saif
Keyword(s):  
Fault Diagnosis ◽  
Estimation Error ◽  
Fault Estimation ◽  
Time Varying ◽  
Satellite Systems ◽  
Adaptive Observers ◽  
Error Dynamics ◽  
The Stability ◽  
Estimation Of Time ◽  
Identification Strategy

This paper presents a novel fault diagnosis approach in satellite systems for identifying time-varying thruster faults. To overcome the difficulty in identifying time-varying thruster faults by adaptive observers, an iterative learning observer (ILO) is designed to achieve estimation of time-varying faults. The proposed ILO-based fault-identification strategy uses a learning mechanism to perform fault estimation instead of using integrators that are commonly used in classical adaptive observers. The stability of estimation-error dynamics is established and proved. An illustrative example clearly shows that time-varying thruster faults can be accurately identified.

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