The purpose of this paper is to investigate the weak form of market efficiency, based on the concept of mean-variance analysis. The investigation initiates with an appraisal of the prediction of future closing prices from past closing prices from a sample comprising the stock of 79 enterprises with large capitalisation listed in Athens Stock Exchange (ASE) for the period of 01/01/2002 to 31/12/2006. The assessment continues with the filter rule test, where the buy or sell signal for going short acts as a detector of short-term movements outside the boundaries of specific risk, in order to appraise the short position in relation to the long position under the criterion of maximum profit generation.
- Inderscience Publishers
- Evaluating Athens Stock Exchange market efficiency: Is a ...
How to Choose the Right Commercial Air Filter
When it comes to selecting a commercial air filter, or air filtration system, there are many variables that have to be considered. In general, the choice of which air filter can be made a bit easier by first defining the overall goal that you are trying to achieve which is usually one of two options. Is the purpose of the filter to protect the air circulation equipment, or is it to provide a better environment for the occupants of the building? Different air filters in different systems serve — you guessed...
Preliminary stabilisation of stormwater biofilters and loss of filter material
Stabilisation affects performance of stormwater biofilters operating under intermittent wetting and drying, mainly due to wash-off of filter material. Understanding the dynamics of solids wash-off is crucial in designing stormwater biofilters. The current study analysed the dynamics of solids wash-off in stormwater biofilters and quantified the loss of solids from the filter. Four Perspex™ bioretention columns (94 mm internal diameter) were fabricated with a filter layer that contained 8% organic material and...
Case study - Performance testing PAHs in soil
These case studies highlight Sitelab’s accuracy from customers who have used the UVF-3100D for testing Target PAHs. This test correlates well to U.S. EPA Method 8270 or similar GC methods, which includes a list of 16 or more compounds. The analyzer is fitted with special optical filters sensitive to this same group of hydrocarbons.Examples of UVF-3100D testing Polycyclic Aromatic Hydrocarbons in Soils vs. Certified Laboratories. Concentrations in ppm (mg/Kg)Manufactured Gas Plant, Coal Tar SiteA contractor...
Application of hybrid Kalman filter for improving water level forecast
Numerical modeling is one of the popular means to simulate and forecast the state of oceanographic systems. However, it still suffers from some limitations, e.g., parameter uncertainties, simplification of model assumptions, and absence of data for proper boundary and initial conditions. This paper proposes a hybrid data assimilation scheme, which combines the Kalman filter (KF) with a data-driven model (local linear model (LM)), to directly correct numerical model outputs at locations without measurements. Two...
The Importance of Water Testing After Natural Disasters
In the aftermath of a natural disaster, particularly earthquakes, infrastructure could be damaged and a safe source of drinking water is often not available. This may be due to damaged pipes or water supplies becoming contaminated. Our colleagues atOxfamstate; “In the initial phases of an emergency it should be assumed that all water sources are contaminated microbiologically. After the initial phase of the emergency is over, investigation can then be undertaken into the microbiological, and where appropriate...