Search results for "Econometric"
showing 10 items of 3780 documents
Flood Frequency Analysis for Sicily, Italy
2006
In this paper a regional flood frequency analysis based on the two-component extreme value TCEV distribution is developed using flood data recorded in Sicily. The hierarchical approach, characterized by three investigation levels for estimating the parameters of the theoretical distribution, is discussed first. The highest level of homogeneity hypothesis with regard to the skewness coefficient was verified by using a Monte Carlo technique and taking account of the separation effect proposed by Matalas et al. in 1975. This analysis also showed 1 the inability of the generalized extreme value model to reproduce the empirical cumulative distribution function CDF of the skewness coefficients, a…
Estimation of flood design hydrographs using bivariate analysis (copula) and distributed hydrological modelling
2014
Abstract. In this paper a procedure to derive Flood Design Hydrographs (FDH) using a bivariate representation of rainfall forcing (rainfall duration and intensity) using copulas, which describe and model the correlation between these two variables independently of the marginal laws involved, coupled with a distributed rainfall-runoff model is presented. Rainfall-runoff modelling for estimating the hydrological response at the outlet of a watershed used a conceptual fully distributed procedure based on the soil conservation service – curve number method as excess rainfall model and a distributed unit hydrograph with climatic dependencies for the flow routing. Travel time computation, based o…
Why Is Equity Order Flow so Persistent?
2014
Order flow in equity markets is remarkably persistent in the sense that order signs (to buy or sell) are positively autocorrelated out to time lags of tens of thousands of orders, corresponding to many days. Two possible explanations are herding, corresponding to positive correlation in the behavior of different investors, or order splitting, corresponding to positive autocorrelation in the behavior of single investors. We investigate this using order flow data from the London Stock Exchange for which we have membership identifiers. By formulating models for herding and order splitting, as well as models for brokerage choice, we are able to overcome the distortion introduced by brokerage. O…
A pre-processing and network analysis of GPS tracking data
2020
Global Positioning System (GPS) devices afford the opportunity to collect accurate data on unit movements from temporal and spatial perspectives. With a special focus on GPS technology in travel surveys, this paper proposes: (1) two algorithms for the pre-processing of GPS data in order to deal with outlier identification and missing data imputation; (2) a clustering approach to recover the main points of interest from GPS trajectories; and (3) a weighted-directed network, which incorporates the most relevant characteristics of the GPS trajectories at an aggregate level. A simulation study shows the goodness-of-fit of the imputation data algorithm and the robustness of the clustering algori…
Foreign Market Entry Mode Research: A Review and Research Agenda
2017
ABSTRACTThis article gives a retrospective look at the main determinants of foreign market entry modes and examines the variables and conditions used in empirical studies in this stream of research. We found that there is an “analytical context hazard” in past studies. The findings suggest: first, future research should focus on developing and extending theories with reference to strategy dimension and market/industry environment; second, the interrelationship between the main entry mode determinants should be figured out; third, attention has to be paid to the entry modes of firms from non-developed economies in research.
Productivity, Ownership and National Chains: Evidence from the British Retail Sector
2009
Abstract This paper investigates factors explaining firms' productivity differences in the British retail sector. In particular, using simultaneous quantile regressions, it aims to uncover performance gaps stemming from foreign ownership and multinationality, as well as national scale economies. The findings suggest that foreign ownership weakly explains differences in performance across retailers. Only when firms in the upper quantiles of the TFP distribution are compared, the role of foreign ownership gains statistical significance, although with exceptions. In addition, firms able to expand their infrastructure across Great Britain possess a productivity advantage over more local retaile…
Using SMAA-2 method with dependent uncertainties for strategic forest planning
2006
Abstract Uncertainty included in forest variables is normally ignored in forest management planning. When the uncertainty is accounted for, it is typically assumed to be independently distributed for the criteria measurements of different alternatives. In forest management planning, the factors introducing the uncertainty can be classified into three main sources: the errors in the basic forestry data, the uncertainty of the (relative) future prices of timber, and the uncertainty in predicting the forest development. Due to the nature of these error sources, most of the involved uncertainties can be assumed to be positively correlated across the alternative management plans and/or criteria.…
Validez de la información financiera en los procesos de insolvencia. Un estudio de la pequeña empresa española
2013
ResumenEn este trabajo nos proponemos un doble objetivo. Por un lado planteamos la posibilidad de que la presente crisis haya afectado de forma desigual a la motivación por la que las empresas fracasan, y por otra parte, como segundo objetivo, pretendemos contrastar la validez de ciertos modelos de predicción en un contexto de fuerte variación provocado por la crisis económica actual.Para ello, inicialmente someteremos la información de 2 muestras de datos financieros de pequeñas empresas a diversas pruebas estadísticas que pongan de manifiesto la variación de la información contable en 2 escenarios: uno de inexistencia de crisis y otro ante la situación de crisis financiera actual. Después…
Measuring autonomy freedom
2006
In the measurement of autonomy freedom, the admissible potential preference relations are elicited by means of the concept of ‘reasonableness’. In this paper we argue for an alternative criterion based on information about the decision maker’s ‘awareness’ of his available opportunities. We argue that such an inter- pretation of autonomy fares better than that based on reasonableness. We then introduce some axioms that capture this intuition and study their logical impli- cations. In the process, a new measure of autonomy freedom is characterized, which generalizes some of the measures so far constructed in the literature.
Functional Data Analysis and Mixed Effect Models
2004
Panel studies in econometrics as well as longitudinal studies in biomedical applications provide data from a sample of individual units where each unit is observed repeatedly over time (age, etc.). In this context, mixed effect models are often applied to analyze the behavior of a response variable in dependence of a number of covariates. In some important applications it is necessary to assume that individual effects vary over time (age, etc.).