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Measuring seaports’ productivity: A Malmquist productivity index decomposition approach

Halkos, George; Tzeremes, Nickolaos - Volkswirtschaftliche Fakultät, … - 2012

This paper uses three different Malmquist Productivity Index (MPI) decompositions to measure Greek seaports’ productivity for the time period 2006-2010. In addition bootstrap techniques are applied in order for confidence intervals of the MPIs and their components to be constructed and...

Persistent link: https://www.econbiz.de/10011260276

Validity and precision of estimates in the classical newsvendor model with exponential and rayleigh demand

Halkos, George; Kevork, Ilias - Volkswirtschaftliche Fakultät, … - 2012

In this paper we consider the classical newsvendor model with profit maximization. When demand is fully observed in each period and follows either the Rayleigh or the exponential distribution, appropriate estimators for the optimal order quantity and the maximum expected profit are established...

Persistent link: https://www.econbiz.de/10009647205

Evaluating alternative estimators for optimal order quantities in the newsvendor model with skewed demand

Halkos, George; Kevork, Ilias - Volkswirtschaftliche Fakultät, … - 2012

This paper considers the classical Newsvendor model, also known as the Newsboy problem, with the demand to be fully observed and to follow in successive inventory cycles one of the Exponential, Rayleigh, and Log-Normal distributions. For each distribution, appropriate estimators for the optimal...

Persistent link: https://www.econbiz.de/10009647405

A note on the choice of Malmquist productivity index and Malmquist total factor productivity index

Halkos, George; Tzeremes, Nickolaos - Volkswirtschaftliche Fakultät, … - 2006

raises some methodological issues regarding the theory of productivity measurement using the Malmquist Productivity Index and …

Persistent link: https://www.econbiz.de/10009151613

Evaluating alternative frequentist inferential approaches for optimal order quantities in the newsvendor model under exponential demand

Halkos, George; Kevork, Ilias - Volkswirtschaftliche Fakultät, … - 2012

Three estimation policies for the optimal order quantity of the classical newsvendor model under exponential demand are … evaluated in the current paper. According to the principle of the first estimation policy, the corresponding estimator is … with its maximum likelihood estimator. The estimator of the second estimation policy is derived in such a way as to ensure …

Persistent link: https://www.econbiz.de/10011110832

Unbiased estimation of maximum expected profits in the Newsvendor Model: a case study analysis

Halkos, George; Kevork, Ilias - Volkswirtschaftliche Fakultät, … - 2012

In the current paper we study a real life inventory problem whose operating conditions match to the principles of the classical newsvendor model. Applying appropriate tests to the available sample of historical demand data, we get the sufficient statistical evidences to support that daily demand...

Persistent link: https://www.econbiz.de/10011114034

The effect of electricity consumption from renewable sources on countries’ economic growth levels: Evidence from advanced, emerging and developing economies

Halkos, George; Tzeremes, Nickolaos - Volkswirtschaftliche Fakultät, … - 2013

This paper uses a sample of 36 countries for the time period 1990-2011 in order to examine the relationship between countries’ electricity consumption from renewable sources and Gross Domestic Product (GDP) levels. Several nonparametric techniques are applied to investigate the effect of...

Persistent link: https://www.econbiz.de/10011259859

Economic growth and carbon dioxide emissions: Empirical evidence from China

Halkos, George; Tzeremes, Nickolaos - Volkswirtschaftliche Fakultät, … - 2011

Using time series data, this paper investigates China’s carbon emissions during 1960-2006, with particular focus on the direct role of growth and in connection to trade and the value added by various sectors like agriculture, industry and services. Our empirical results indicate the presence...

Persistent link: https://www.econbiz.de/10009246885

A conditional full frontier modelling for analyzing environmental efficiency and economic growth

Halkos, George; Tzeremes, Nickolaos - Volkswirtschaftliche Fakultät, … - 2011

By applying conditional and unconditional data envelopment analysis (DEA) models along side with statistical inference using bootstrap techniques; this paper investigates the link between China’s carbon dioxide emissions (CO2) environmental efficiency and its economic growth (measured in GNI...

Persistent link: https://www.econbiz.de/10009246900

Kuznets curve and environmental performance: evidence from China

Halkos, George; Tzeremes, Nickolaos - Volkswirtschaftliche Fakultät, … - 2011

The paper investigates China’s environmental performance-economic development relationship for the time period of 1965-2009. The results indicate that after 1990 China increased its environmental performance mainly driven by the implementation of several environmental policies. In addition...

Persistent link: https://www.econbiz.de/10009353829