This study explores the multipower variation integrated volatility estimates using high frequency data in financial stock market. The different combinations of multipower variation estimators are robust to drastic financial jumps and market microstructure noise. In order to examine the informationally market efficiency, we proposed a rolling window estimate procedures of Hurst parameter using the modified rescale-range approach. In order to test the robustness of the method, we have selected the S&P500 as the empirical data. The empirical study found that the long memory cascading volatility is fluctuating across the studied period and drastically trim down after the subprime mortgage crisis. This time-varying long memory analysis allow us to understand the informationally market efficiency before and after the subprime mortgage crisis in U.S.

Social media has changed the way travellers see and experience their trips. It creates opportunities for travellers to search for useful travel information, choose destinations and also shares their travel experiences. The aim of this study is to investigate the influence of positive and negative experiences shared on social media as well as subjective norms towards tourists’ decisions on destination choice by adapting the Theory of Planned Behaviour (TPB). Based on a cross-sectional design, self-administered questionnaires were distributed to local tourists in Klang Valley, Malaysia. A total of 340 respondents were accessed based on the convenience sampling technique. The Multiple Linear Regression technique analysis was employed to test the research hypotheses. The results revealed positive experiences shared on social media and subjective norms perform as important predictors to explain tourists’ behavioural intention to visit a certain destination. In conclusion, this study provides valuable information to destination management organisations in terms of social media management in the development of strategic plans to increase tourists’ behavioural intention.

This study evaluates the time-varying long range dependence behaviors of the S&P 500 volatility, index using the modified rescaled adjusted range (R/S) statistic which takes into account the possible covariances of the lags in the data. 5916 Chin Wen Cheong et al. Instead of a single estimation for the whole time span, the variations of the long range dependence are computed using the moving window rolling estimates approach. For a better computational result, a high frequency data set under the representation of bipower variation realized volatility is used to avoid possible abrupt jump. As for the empirical study, we have selected the period covered before and after the subprime mortgage crisis. The empirical results show that the long range dependence is influenced by the related economic events across the studied period. This time varying long range dependence analysis allow us to understand the informationally market efficiency before and after the subprime mortgage crisis.

No abstract

Para-Bombay blood phenotype is a rare blood group with limited cases reported worldwide. This blood group is characterized by the absence of ABH antigen on red blood cells but presence of ABH secretor substances in the body secretion. This rare phenotype is usually misinterpreted as O and may endanger the patient if urgent blood transfusion is required. A mother who was labelled as group O Rh D positive during antenatal follow-up was found to have ABO discrepancy during delivery. The newborn was admitted for extremely premature delivery at 25 weeks. As the baby required transfusion, problem arose during cross matching with the mother’s sample. It was found that the mother was group O Rh D positive in forward grouping. However, the reverse grouping showed the presence of reaction (2+) in O cells. The baby was grouped as O Rh D positive. As transfusion was urgently needed due to baby’s unstable condition, group O Rh D positive packed cell was found compatible with baby’s serum, subsequently transfused. Bombay blood donor was contacted, and the donated blood was sent to the hospital for further management. Further investigations were performed, indicating that the mother is para-Bombay A. Due to recent transfusion to baby, we suggested to repeat baby’s blood group after the baby is one year old. Para-Bombay was usually mislabelled as O if the sample was not tested with O cell in reverse grouping. Additional tests may be needed during antenatal follow-up to prevent complications during delivery, which requires emergency blood transfusion.