浅谈标准化在油田酸化施工中的作用

针对文留油田在注水开发后期地层污染堵塞严重,近几年酸化效果偏低的情况,加强了对酸化标准的制、修订工作,从选井原则到对酸化的效果评价一系列操作流程,建立油水井酸化工艺标准体系,成立了酸化措施管理项目组,加大了过程监督。经过标准体系在酸化施工中一年来的应用,酸化效果得到了明显改善。     

我国银行特许权价值的决定因素分析

本文从市场相关和银行相关角度,运用面板数据模型,对我国14家上市银行特许权价值的决定因素进行了实证检验.结果发现,决定我国上市银行特许权价值的主要因素包括以银行为导向的金融结构,银行业垄断性和宏观经济因素;但并没有发现银行控股股东性质对银行特许权价值的显著影响.     

A study of earnings-management motives in the Anglo-American and Euro-Continental accounting models: The Canadian and French cases

The purpose of this paper is to investigate factors that potentially influence earnings-management policy with reference to the Anglo-American and Euro-Continental accounting models. Canada and France, respectively, belong to those different socio-economic environments. Earnings-management practices detected in those countries are expected to be affected by specific socio-economic features of the Anglo-American and the Euro-Continental environments. We explain earnings-management practices by incentives suggested in the literature to reveal which motives are prominent within each environment.We tested our earnings-management motives (EMM) model using appropriate panel-estimation techniques over 1674 Canadian and 1470 French firm-year observations. Our results provide evidence that incentives for earnings management for French firms are specifically linked to contractual debt costs and effective tax rate. However, Canadian firms show specific incentives matched with a dynamic capital market. Issuing equity is a strong motive for earnings management in Canadian firms.     

Why panel tests of purchasing power parity should allow for heterogeneous mean reversion

Recent studies of purchasing power parity (PPP) use panel tests that fail to take into account heterogeneity in the speed of mean reversion across real exchange rates. In contrast to several other severe restrictions of panel models and tests of PPP, the assumption of homogeneous mean reversion is still widely used and its consequences are virtually unexplored. This paper analyzes the properties of homogeneous and heterogeneous panel unit root testing methodologies. Using Monte Carlo simulation, we uncover important adverse properties of the panel approach that relies on homogeneous estimation and testing. More specifically, power functions are low and assume irregular shapes. Furthermore, homogeneous estimates of the mean reversion parameters exhibit potentially large biases. These properties can lead to misleading inferences on the validity of PPP. Our findings highlight the importance of allowing for heterogeneous estimation when testing for a unit root in panels of real exchange rates.     

Market Microstructure Empirical Regularities: Behavior of the Bid-Ask Spread and Closing Prices

A substantial number of last reported transactions for stocks trading on the New York Stock Exchange occur inside the quoted closing bid-ask spread. The tendency to close inside the spread results in price change magnitudes much smaller than those predicted from binomial models. Moreover, although the change magnitude is biased by the underlying trend of the market, the distribution of next day price change relatives is largely unaffected. The result is a systematic regularity between the location of today's close and tomorrow's close relative to the bid-ask spread.