The aim of this paper is the establishment and validation of cost functions for the various assets of sewer systems, namely gravity and raising pipes, manholes and pumping-stations. Costs are defined as a function of the main physical characteristics of the assets, such as, the pipe material and...

Minimum night flow (MNF) is a common method used to evaluate water loss in a water network. In 2010, the average percentage of non-revenue water for the state of Perak in Malaysia was 29.4 %, a figure which resulted in major financial, supply, and pressure losses, as well as excessive energy...

The penalized maximum likelihood estimator (PMLE) has been widely used for variable selection in high-dimensional data. Various penalty functions have been employed for this purpose, e.g., Lasso, weighted Lasso, or smoothly clipped absolute deviations. However, the PMLE can be very sensitive to...

In this paper, the authors analyze the main aspects regarding the use of the multiple regression model in the analysis of the Gross Domestic Product of Romania, during the period 1990 – 2010. In this context, there are used as explicative variables, the values of the final consumption, gross...

The study aims to determine factors of influence acting on the company's net profit by using quantitative methods of data analysis that will lead to results of research to highlight the impact on current practice and future development directions. Research identifies first links between the...