Search results for "ESTIMATION"
showing 10 items of 924 documents
Determinants of Sub-Sovereign Government Ratings In Europe
2017
The aim of this paper is to identify the determinantsof the rating assigned to sub-sovereignentities in Germany, Austria, Belgium, France,Italy and Spain, using a total of 92 territorial entitiesfor the 1989-2012 period. Multinomial orderedprobit estimation models were estimatedfor each specifi cation and agency.We conclude that the country’s rating is oneof the most important determinants of regionalgovernment’s ratings with a positive infl uence(as expected), and that the country debt/GDPratio is a stronger determinant for regions thantheir own indebtedness with a negative sign.Other relevant variables are population growthrate, unemployment rate, elderly people weight,regional public exp…
Problemas en la estimación y en el contraste de los rendimientos anormales a largo plazo: Estado de la cuestión
2002
-Jose.E.Farinos@uv.es -Ana.M.Ibanez@uv.es El paradigma de la eficiencia ha sido puesto en entredicho en las últimas décadas como consecuencia de la obtención de rendimientos anormales, estadística y económicamente significativos, durante amplios periodos de tiempo tras algunas importantes decisiones empresariales. No obstante, los problemas conceptuales y estadísticos que presenta la medición y contrastación de los rendimientos anormales a largo plazo ha supuesto que la evidencia obtenida pase a calificarse como anomalía. Dada la escasa proliferación de este tipo de estudios en nuestro mercado y el desafortunado desarrollo de algunos de los existentes, en este trabajo presentamos estos prob…
Development of an earth observation processing chain for crop bio-physical parameters at local scale
2015
This paper proposes a full Earth observation processing chaing for biophysical parameter estimation at local scales. In particular, we focus on the Leaf Area Index (LAI) as an essential climate variable required for the monitoring and modeling of land surfaces at local scale. The main goal of this study is tied to the use of optical satellite images to retrieve Earth Observation (EO) biophysical parameters able to describe the spatio-temporal changes in agro-ecosystems at local scale. The objective of this work is two-fold: (i) to set up and update the EO products processing chain at high resolution (local) scale; and (ii) derive multitemporal LAI maps at 30 m resolution to be fed into a cr…
Statistical biophysical parameter retrieval and emulation with Gaussian processes
2019
Abstract Earth observation from satellites poses challenging problems where machine learning is being widely adopted as a key player. Perhaps the most challenging scenario that we are facing nowadays is to provide accurate estimates of particular variables of interest characterizing the Earth's surface. This chapter introduces some recent advances in statistical bio-geophysical parameter retrieval from satellite data. In particular, we will focus on Gaussian process regression (GPR) that has excelled in parameter estimation as well as in modeling complex radiative transfer processes. GPR is based on solid Bayesian statistics and generally yields efficient and accurate parameter estimates, a…
Climatic Characterization and Phenology of Local Peach Genotypes in the Udzungwa Uplands of Tanzania
2014
The phenology of two local peach genotypes was studied to verify whether peaches can be produced in the Tanzanian uplands. Observations were conducted on trees of one early- and one late-ripening peach genotype in 2010 and 2011. Temperature trends were reconstructed and three chilling estimation models were tested. The two peach genotypes differed for timing of flower and leaf bud-break. Common symptoms of insufficient chilling (presence of numerous stages at a specific date and about 20% of undeveloped flower buds) were observed in the late genotype. Both Utah and Dynamic models indicated low chilling accumulation, lower than the Mean Temperature model in most cases. This is inconsistent w…
Fiscal Policy Responsiveness, Persistence and Discretion
2008
This paper analyzes the different characteristics of fiscal policy using a two-step estimation procedure. First, we decompose both government spending and government revenue into three components: responsiveness, persistence and discretion. Second, we assess the determinants of these characteristics. Using data from 132 countries, our results show that fiscal policy is more persistent than responsive to economic conditions, which implies that the authorities may have less leeway in the short-run notably to curb spending behavior. In addition, countries characterized by greater fiscal persistence have less discretion and responsiveness. Finally, macroeconomic, institutional and geographic va…
Putting Inputs to Work in Elementary Schools: What Can Be Done in the Philippines?
1997
The paper consists in estimating a value-added educational production function of primary education in the Philippines. The information used match household and school-based survey data. The Huber White technique is used so as to take into account the problem of heteroscedasticity when merging individual pupil variables with class/school variables; this procedure helps relate the outcome side of the production (student learning) that concerns the individual level with the input side (school inputs such as teacher qualification, class-size, availability of pedagogical materials, ..) that concerns an aggregate level (class or school). The results show that students taught by a teachers holdin…
Spreads of bonds issued by sub-sovereign European governments
2017
[EN] This paper identifies the factors that affect the spread of fixed and variable type bonds in the primary and secondary markets issued by sub-sovereign European governments. The analyses of both markets will be done separately to compare whether the determinants in the primary market coincide with those in the secondary market. The analyses will examine the period between February 2008 and December 2013 using data panel estimations. The conclusions are that both markets are approximately identical behavior and the signs of the variables matched what was expected in nearly every case. Also, we concluded that the most important in determining the spread sub-sovereign variable is the sprea…
Image is everything! Professional football players’ visibility and wages: evidence from the Italian Serie A
2021
Sport is one of the most popular forms of entertainment and its worldwide spread has turned athletes into icons who have economic impact and international visibility as global brands. In our paper we would like to show how marketing strategies in the sports industry, amplified by social networks, have put the athlete at the centre of media attention In the world of football, football players have come to play a key role, since their image is the face of their clubs, and this can affect the number of digital fans, that is, fans who are not bound to a club by constant passion but who can change team depending on the athletes that have been lined up. This could explain why the teams playing in…
ESTIMATING INCENTIVE AND WELFARE EFFECTS OF NONSTATIONARY UNEMPLOYMENT BENEFITS
2013
The distribution of unemployment duration in our equilibrium matching model with spell-dependent unemployment benefits displays time-varying exit rates. Building on semi-Markov processes, we translate these rates into an expression for the aggregate unemployment rate. Structural estimation using German microdata allows us to discuss the effects of an unemployment benefit reform (Hartz IV). The reform reduced unemployment by less than 0.1 percentage points. Contrary to general beliefs, the net wage for most skill and regional groups increased. Taking the insurance effect of unemployment benefits into account, however, the reform is welfare reducing for 76% of workers.