Motivated by a recent paper on the effect of lead-time variability reduction on safety stocks, we provide evidence of the recursive nature of safety stock changes. When lead times follow a gamma distribution we demonstrate that, for cycle service levels between .60 and .70, the reduction of lead-time variability will first increase safety stock and then either recursively decrease safety stock ...

Using certain artificial intelligence techniques, stock data mining has given encouraging results in both trend analysis and similarity search. However, representing stock data effectively is a key issue in ensuring the success of a data mining process. In this paper, we aim to compare the performance of numeric and symbolic data representation of a stock dataset in terms of similarity search. ...

This research studies the moderating effect of country-specific social connectedness on the relation between financial literacy and stock market participation. This is done by using the extensive and multi-country SHARE data. The positive relation between financial literacy and stock market participation is reconfirmed. Moreover, the findings show that country-specific social connectedness sign...

Should the national economy lead the stock market or the other way round? Using co-integration test and Granger causality test, this paper analyzes the relationship between the stock index and the national economy in the case of China. The result of the empirical analysis indicates that there is no co-integration relationship between the stock index and the national economy in China. In additio...

BACKGROUND To evaluate the type and frequency of antiretroviral drug stock-outs, and their impact on death and interruption in care among HIV-infected patients in Abidjan, Côte d'Ivoire. METHODS AND FINDINGS We conducted a cohort study of patients who initiated combination antiretroviral therapy (cART) in three adult HIV clinics between February 1, 2006 and June 1, 2007. Follow-up ended on Fe...

The paper jointly models the evolution of compliance with regulation and the evolution of a CPR stock, by combining replicator dynamics describing compliance with harvesting rules, with resource stock dynamics. This evolutionary approach suggests that coexistence, in long run equilibrium, of both cooperative and non-cooperative rules under regulation is possible. Stock effects on profits and a ...

Social media-based forecasting has received significant attention from academia and industries in recent years. With a focus on Twitter, this paper investigates whether sentiments of the tweets regarding the 7 largest US financial service companies (in U.S. dollars) are related to the stock price changes of these companies. The authors’ findings indicate, in the financial services context, nega...

The experimental approach is applied to explore the value of unidentified historical information in stock-return prediction. Return sequences were randomly drawn cross section and time from historical S&P500 data. Subjects were requested to predict returns or select stocks from 12 preceding realizations. The hypothesis that predictions are randomly assigned to historical sequences is rejected i...

The aim of this study was to compare, under controlled conditions, reproduction results of cultured and wild stock of the chub. Wild fish spawned only once a season whereas the cultured stock spawned at least two times. In the multiple-spawn stock, fewer fish spawned and the weight of produced oocytes was reduced compared to the single-spawn stock. Larvae obtained from the multi-spawn forms wer...

This paper presents a general stock model for fuzzy markets based on a class of fuzzy process, that is, geometric Liu process. Firstly, a brief history of stock models and some methodologies used in stochastic stock models have been reviewed. Next, some useful concepts and properties about fuzzy process are presented. Then, a general stock model for fuzzy markets is formulated by way of fuzzy d...