Results
author = "Costa, Àlex"
An empirical evaluation of five small area estimators
Author(s) :
Costa, Alex
Description :
This paper compares five small area estimators. We use Monte Carlo simulation in the context of both artificial and real populations. In addition to the direct and indirect estimators, we consider the optimal composite estimator with population weights, and two composite estimators with estimated we...
Repository :
Dipòsit Digital de Documents de la UAB
Language(s) :
English
Improving both domain and total area estimation by composition
Author(s) :
Costa, Alex
Description :
In this article we propose small area estimators for both the small and large area parameters. When the objective is to estimate parameters at both levels, optimality is achieved by a sample design that combines fixed and proportional allocation. In such a design, one fraction of the sample is distr...
Repository :
Dipòsit Digital de Documents de la UAB
Language(s) :
English
Improving small area estimation by combining surveys : new perspectives in regional statistics
Author(s) :
Costa, Alex
Description :
A national survey designed for estimating a specific population quantity is sometimes used for estimation of this quantity also for a small area, such as a province. Budget constraints do not allow a greater sample size for the small area, and so other means of improving estimation have to be devise...
Repository :
Dipòsit Digital de Documents de la UAB
Language(s) :
English
On the performance of small-area estimators : fixed vs. random area parameters
Author(s) :
Costa, Alex
Description :
Most methods for small-area estimation are based on composite estimators derived from designor model-based methods. A composite estimator is a linear combination of a direct and an indirect estimator with weights that usually depend on unknown parameters which need to be estimated. Although model-ba...
Repository :
Dipòsit Digital de Documents de la UAB
Language(s) :
English
Esquemas reproductivos y teorema sobre bienes autorreproducibles
Author(s) :
Costa, Alex
Description :
Repository :
Biblos-e Archivo Universidad Autonoma de Madrid
Language(s) :
Spanish
Estructura y semántica de la teoría neoclásica del intercambio puro
Author(s) :
Costa, Álex
Description :
Repository :
Biblos-e Archivo Universidad Autonoma de Madrid
Language(s) :
Spanish
The p23 co-chaperone protein is a novel substrate of CK2 in Arabidopsis
Author(s) :
COSTA, ALEX
Description :
The ubiquitous Ser/Thr protein kinase CK2,
which phosphorylates hundreds of substrates and is
essential for cell life, plays important roles also in plants;
however, only few plant substrates have been identified so
far. During a study aimed at identifying proteins targeted
by CK2 in plant response ...
Repository :
AIR - Archivio Istituzionale della Ricerca
Language(s) :
English
Histidines Are Responsible for Zinc Potentiation of the Current in KDC1 Carrot Channels
Author(s) :
COSTA, ALEX
Description :
Unlike all plant inward-rectifying potassium channels, the carrot channel KDC1 has two histidine pairs
(H161,H162) in the S3–S4 and (H224,H225) in the S5–S6 linkers. When coinjected with KAT1 in Xenopus oocytes, KDC1
participates in the formation of heteromultimeric KDC1:KAT1 channels and the ionic ...
Repository :
AIR - Archivio Istituzionale della Ricerca
Language(s) :
English
A procedure for localisation and electrophysiological characterisation of ion channels heterologously expressed in a plant context
Author(s) :
COSTA, ALEX
Description :
Background: In silico analyses based on sequence similarities with animal channels have identified
a large number of plant genes likely to encode ion channels. The attempts made to characterise
such putative plant channels at the functional level have most often relied on electrophysiological
analys...
Repository :
AIR - Archivio Istituzionale della Ricerca
Language(s) :
English
Redox Regulation of a Novel Plastid-Targeted beta-Amylase of Arabidopsis
Author(s) :
COSTA, ALEX
Description :
Nine genes of Arabidopsis (Arabidopsis thaliana) encode for b-amylase isozymes. Six members of the family are predicted to be
extrachloroplastic isozymes and three contain predicted plastid transit peptides. Among the latter, chloroplast-targeted
b-amylase (At4g17090) and thioredoxin-regulated b-amy...
Repository :
AIR - Archivio Istituzionale della Ricerca
Language(s) :
English