A5057815685- Statistical Methods and Bayesian Inference
- Advanced Statistical Methods and Models
- Advanced Statistical Modeling Techniques
- Psychometric Methodologies and Testing
- Statistical Methods and Inference
- Mental Health Research Topics
- Statistical Methods in Clinical Trials
- Data Analysis with R
- Bayesian Methods and Mixture Models
- Bayesian Modeling and Causal Inference
- Reliability and Agreement in Measurement
- Advanced Causal Inference Techniques
- Optimal Experimental Design Methods
- Galaxies: Formation, Evolution, Phenomena
- Statistical and numerical algorithms
- School Choice and Performance
- Gaussian Processes and Bayesian Inference
- Opinion Dynamics and Social Influence
- Adenosine and Purinergic Signaling
- Education and Teacher Training
- Multi-Criteria Decision Making
- Statistical Methods and Applications
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Survey Sampling and Estimation Techniques
Pontificia Universidad Católica de Chile
2015-2024
Millennium Science Initiative
2022-2024
University of Wisconsin–Madison
2022
McGill University
2022
Umeå University
2022
University of Amsterdam
2022
Millennium Institute on Immunology and Immunotherapy
2020
Instituto Tecnológico de Tijuana
2017-2018
KU Leuven
2006-2008
We present a detailed analysis from new multi-wavelength observations of the exceptional galaxy cluster ACT-CL J0102-4915 "El Gordo," likely most massive, hottest, X-ray luminous and brightest Sunyaev-Zeldovich (SZ) effect known at z>0.6. The Atacama Cosmology Telescope collaboration discovered El Gordo as significant SZ decrement in sky survey area 755 deg^2. Our VLT/FORS2 spectra 89 member galaxies yield redshift, z=0.870, velocity dispersion, s=1321+/-106 km/s. Chandra reveal hot system...
We present the first dynamical mass estimates and scaling relations for a sample of Sunyaev-Zel'dovich effect (SZE) selected galaxy clusters. The consists 16 massive clusters detected with Atacama Cosmology Telescope (ACT) over 455 sq. deg. area southern sky. Deep multi-object spectroscopic observations were taken to secure intermediate-resolution (R~700-800) spectra redshifts ~60 member galaxies on average per cluster. masses M_200c have been calculated using simulation-based between...
We present optical and X-ray properties for the first confirmed galaxy cluster sample selected by Sunyaev–Zel'dovich effect (SZE) from 148 GHz maps over 455 deg2 of sky made with Atacama Cosmology Telescope (ACT). These maps, coupled multi-band imaging on 4 m class telescopes, have yielded a 23 clusters redshifts between 0.118 1.066. Of these clusters, 10 are newly discovered. The selection this is approximately mass limited essentially independent redshift. provide positions, images,...
Structural equation models are commonly used to analyze 2-mode data sets, in which a set of objects is measured on variables. The underlying structure within the object mode evaluated using latent variables, by indicators coming from variable mode. Additionally, when under different conditions, 3-mode arise, and with this, simultaneous study correlational 2 modes may be interest. In this article authors present model for 3 such set. They an empirical illustration method (person situation...
Equating is a family of statistical models and methods that are used to adjust scores on two or more versions test, so the from different tests may be interchangeably. In this paper we present R package SNSequate which implements both standard nonstandard for test equating. The construction was motivated by need having modular, simple, yet comprehensive, general software carries out traditional new equating methods. currently mean, linear equipercentile methods, as well mean-mean,...
To elucidate the role of extracellular histidines in modulation rat P2X4 receptor by trace metals, we generated single, double, and triple histidine mutants for residues 140, 241, 286, replacing them with alanines. cDNAs wild-type were expressed Xenopus laevis oocytes human embryonic kidney 293 cells examined two electrode patch clamp techniques, respectively. Whereas copper inhibited concentration-dependently ATP-gated currents single or double H241A H286A mutants, all receptors containing...
The Poisson's binomial (PB) is the probability distribution of number successes in independent but not necessarily identically distributed binary trials. non-identically case emerges naturally field item response theory, where answers to a set items are conditionally given level ability, with different probabilities success. In many applications, represents score obtained by individuals, and compound (CB) has been used obtain probabilities. It shown here that PB CB distributions lead...
Equating methods make use of an appropriate transformation function to map the scores one test form into scale another so that are comparable and can be used interchangeably. The equating literature shows ways judging success (i.e., score transformation) might differ depending on adopted framework. Rather than targeting different parts process aiming evaluate from aspects, this article views as a standard statistical estimator discusses how should assessed in For kernel framework, numerical...
A power analysis of seven normality tests against the Ex-Gaussian distribution (EGd) is presented. The EGd selected on basis that it a particularly well-suited to accommodate positively skewed distributions such as those observed in reaction times data. pre-assessment across various types was done via meta-analysis and comparison with other analyses reported literature also performed. General recommendations are given which should be used test data suspected resemble an EG distribution....
Summary In education studies value added is by and large defined in terms of a test score distribution mean. Therefore, all except particular summary the ignored. Developing value-added definition that incorporates entire conditional students' scores given school effects control variables would produce more complete picture school's effectiveness as result provide accurate information could better guide policy decisions. Motivated part current debate surrounding recent proposal eliminating...
The goal of this commentary is to provide some additional results the interesting and provocative paper Maris Bechger (this issue). More specifically, we have three aims. First, want t...
This paper aims to contribute the discussion about teacher quality in Chile through two approaches: (a) one based on estimates of value added by teachers or effect students' learning, gauged exploring role teachers' characteristics and context which they work (school municipality); (b) another seeks predict student performance using variables characteristics. Hierarchical linear models were used both analyses. The data came from Chile's National Teacher Evaluation System, Education Quality...
We propose a Bayesian nonparametric strategy to test for differences between control group and several treatment regimes. Most of the existing tests this type comparison are based on location parameters. In contrast, our approach identifies across entire distribution, avoids strong modeling assumptions over distributions each treatment, accounts multiple testing through prior distribution space hypotheses. The proposal is compared other commonly used hypothesis procedures under simulated...
Based on Lord's criterion of equity equating, van der Linden (this issue) revisits the so‐called local equating method and offers alternative as well new thoughts several topics including types transformations, symmetry, reliability, population invariance appropriate for equating. A remarkable aspect is to define a standard statistical inference problem in which true transformation parameter interest that has be estimated assessed any evaluation an estimator unknown statistics. We believe...
Acute-on-chronic liver failure (ACLF) is associated with reduced short-term survival, and transplantation frequently the only therapeutic option. Nonetheless, post-transplantation prognosis seems to be worse in ACLF patients.The databases of two university centers were retrospectively evaluated, adult patients cirrhosis who underwent between 2013 2020 included. One-year survival was compared that without ACLF. Variables mortality identified.A total 428 303 met inclusion criteria; 57.1% male,...
Abstract To further analyze the action of copper on brain synaptic mechanisms, dipeptide carnosine (β‐alanyl‐ l ‐histidine) was tested in Xenopus laevis oocytes expressing rat P2X 4 or 7 receptors. Ten micromolar halved currents evoked by ATP both receptors; co‐application plus prevented metal induced‐inhibition with a median effective concentration 12.1 ± 3.9 and 12.0 5.5 µ m for , respectively. Zinc potentiated only ATP‐evoked currents; had no effect over this metal. The relative potency...