Search results for "ESTIMATION"
showing 10 items of 924 documents
Microfinance Mission Drift?
2010
Claims have been made that microfinance institutions (MFIs) experience mission drift as they increasingly cater to customers who are better off than their original customers. We investigate mission drift using average loan size as a main proxy and the MFI?s lending methodology, main market, and gender bias as further mission drift measures. We employ a large data set of rated, multi-country MFIs spanning 11 years, and perform panel data estimations with instruments. We find that the average loan size has not increased in the industry as a whole, nor is there a tendency towards more individual loans or a higher proportion of lending to urban costumers. Regressions show that an increase in av…
Estimating Engel curves under unit and item nonresponse
2010
SUMMARY This paper estimates food Engel curves using data from the first wave of the Survey on Health, Aging and Retirement in Europe (SHARE). Our statistical model simultaneously takes into account selectivity due to unit and item nonresponse, endogeneity problems, and issues related to flexible specification of the relationship of interest. We estimate both parametric and semiparametric specifications of the model. The parametric specification assumes that the unobservables in the model follow a multivariate Gaussian distribution, while the semiparametric specification avoids distributional assumptions about the unobservables. Copyright © 2011 John Wiley & Sons, Ltd.
Primary commodity prices: co-movements, common factors and fundamentals
2011
The behavior of commodities is critical for developing and developed countries alike. This paper contributes to the empirical evidence on the co-movement and determinants of commodity prices. Using nonstationary panel methods, the authors document a statistically significant degree of co-movement due to a common factor. Within a Factor Augmented VAR approach, real interest rate and uncertainty, as postulated by a simple asset pricing model, are both found to be negatively related to this common factor. This evidence is robust to the inclusion of demand and supply shocks, which both positively impact on co-movement of commodity prices.
Educational intentions, cognitive skills and earnings expectations of French undergraduates
2014
International audience; This article aims to study the earnings expectations of first-year students at a French university. Our findings highlight the importance of the environment in which students make their choices about education. Expected earnings are proportionally higher when their parents seem to be involved in the careers guidance, taking into account the effect of parental socio-economic status. The positive opinion of parents about the orientation or the connection between the discipline and the father's occupation are generally associated with higher earnings. In addition, our results show a strong impact of cognitive variables which are far more significant than variables relat…
Les étudiants anticipent-ils correctement la valeur de leur diplôme sur le marché du travail ?
2013
Documents de travail de l'IREDU, n°2013-1; Ce travail analyse la manière dont les étudiants de première année d'université anticipent leurs salaires futurs, puis compare ces salaires à ceux qu'ils peuvent réellement observer sur le marché du travail. Nos résultats montrent globalement une surestimation des salaires anticipés d'environ 9 pour cent en début de carrière, ce qui est cohérent avec des travaux réalisés dans d'autres pays. En revanche, les salaires anticipés après dix ans de carrières sont supérieurs de 28 pour cent aux salaires observés des diplômés à ancienneté comparable. Les résultats soulignent également l'importance de l'environnement familial lors du choix des études supéri…
Comment les étudiants pourraient réagir face à une hausse du coût de leurs études ?
2014
La théorie économique traditionnelle suppose que les étudiants décident de leurs études en fonction des coûts et des bénéfices anticipés de leur investissement scolaire. L'objectif de notre communication, basée essentiellement sur une recherche empirique, est de s'interroger sur l'information dont disposent les étudiants sur le rendement de leurs études en fonction notamment de leurs caractéristiques scolaires et socioéconomiques, puis leur réaction face à une hausse du coût de leur scolarité. A partir d'une enquête sur 400 étudiants en sciences humaines et sociales d'une université française, nous proposons dans un premier temps d'estimer la rentabilité qu'ils attribuent à leur projet scol…
Key Electoral Institutions and Rules Influencing Proportionality and Partisan Bias in Spanish Politics
2021
The current paper focuses on the Spanish electoral rules governing political competition for the central “Congreso de los Diputados”. It is well-documented that the system as a whole has traditionally favoured one or the other of the two main political parties (PP and PSOE) at the expense of proportionality and the remaining political parties. This paper focuses on some key Spanish electoral rules and investigates how much the observed biases could be altered by introducing some alternative rules taken from the Swedish electoral system, ceteris paribus. Measures of disproportionality are made through the Loosemore–Hanby index and the Gallagher index. The electoral raw data used for our esti…
Dynamical Compensation of the Load Torque in a High-Performance Electrical Drive with an Induction Motor
2018
This paper describes a new method for dynamical estimation of load disturbance in induction motors by using Nonlinear Unknown Input Observers (NUIO). This estimation is then used to compensate dynamically the load torque in a Field Oriented Control (FOC) induction motor drive to increase its load-rejection capability. The method has been verified both in simulation and experimentally on a experimental rig.
Modelling, simulation and characterization of a supercapacitor
2020
In the last decade, the issue of air pollution or the reduction of CO2 emissions has become of extreme interest both for civil society and then for the industrial and scientific research world. For this reason, the scientific research on automotive is called to answer with increasingly innovative solutions. One of the principal subjects are the storage and the utilization of the electric energy for electrical and hybrid vehicles. Nowadays, supercapacitors are getting more and more attention because of their characteristics that allow them to be a bridge between electrolytic capacitors and batteries in several application such as bust-mode energy delivery, regenerative breaks and so on. The …
Compensation of missing wedge effects with sequential statistical reconstruction in electron tomography.
2014
Electron tomography (ET) of biological samples is used to study the organization and the structure of the whole cell and subcellular complexes in great detail. However, projections cannot be acquired over full tilt angle range with biological samples in electron microscopy. ET image reconstruction can be considered an ill-posed problem because of this missing information. This results in artifacts, seen as the loss of three-dimensional (3D) resolution in the reconstructed images. The goal of this study was to achieve isotropic resolution with a statistical reconstruction method, sequential maximum a posteriori expectation maximization (sMAP-EM), using no prior morphological knowledge about …