نتایج جستجو برای: instrumental error

تعداد نتایج: 281565  

2007
Mark J. Roberts Emmanuel Skoufias

This note estimates the long-run demand for skilled and unskilled labor using panel data for Colombian manufacturing plants. Unobserved heterogeneity and measurement error problems that commonly arise in microdata production estimates are examined. Output measurement errors cause OLS estimators to underestimate the output and wage response of employment demand. Time-difference estimators exagge...

2015
Francisco Casas David Ortiz Enrique Villa Juan L. Cano Jaime Cagigas Ana R. Pérez Beatriz Aja J. Vicente Terán Maria Luisa de la Fuente Eduardo Artal Roger Hoyland Ricardo Génova-Santos

This paper presents preliminary polarization measurements and systematic-error characterization of the Thirty Gigahertz Instrument receiver developed for the QUIJOTE experiment. The instrument has been designed to measure the polarization of Cosmic Microwave Background radiation from the sky, obtaining the Q, U, and I Stokes parameters of the incoming signal simultaneously. Two kinds of linearl...

2010
A. Colin Cameron Douglas L. Miller

In this paper we survey methods to control for regression model error that is correlated within groups or clusters, but is uncorrelated across groups or clusters. Then failure to control for the clustering can lead to understatement of standard errors and overstatement of statistical signi cance, as emphasized most notably in empirical studies by Moulton (1990) and Bertrand, Du o and Mullainath...

2018
Emma N. Cahill George H. Vousden Marc T.J. Exton-McGuinness Ian R.C. Beh Casey B. Swerner Matej Macak Sameera Abas Cameron C. Cole Brian F. Kelleher Barry J. Everitt Amy L. Milton

Under certain conditions pavlovian memories undergo reconsolidation, whereby the reactivated memory can be disrupted by manipulations such as knockdown of zif268. For instrumental memories, reconsolidation disruption is less well established. Our previous, preliminary data identified that there was an increase in Zif268 in the posterior dorsolateral striatum (pDLS) after expression of an instru...

Journal: :Statistics in medicine 1998
N D Yanez R A Kronmal L R Shemanski

Biomedical studies often measure variables with error. Examples in the literature include investigation of the association between the change in some outcome variable (blood pressure, cholesterol level etc.) and a set of explanatory variables (age, smoking status etc.). Typically, one fits linear regression models to investigate such associations. With the outcome variable measured with error, ...

2016
Bryan Roche Michael W. Schlund Simon Dymond Gemma Cameron

Background and Objectives Conditioned fear may emerge in the absence of directly experienced conditioned stimulus (CS) – unconditioned stimulus (US) pairings. Here, we compared three pathways by which avoidance of the US may be acquired both directly (i.e., through trial-and-error instrumental learning) and indirectly (i.e., via verbal instructions and social observation). Methods Following fea...

Journal: :SIAM J. Numerical Analysis 2008
José Manuel Cascón Christian Kreuzer Ricardo H. Nochetto Kunibert G. Siebert

We analyze the simplest and most standard adaptive finite element method (AFEM), with any polynomial degree, for general second order linear, symmetric elliptic operators. As is customary in practice, the AFEM marks exclusively according to the error estimator and performs a minimal element refinement without the interior node property. We prove that the AFEM is a contraction, for the sum of th...

2009
S. SMALL PAUL R. ROSENBAUM P. R. ROSENBAUM

A predictor variable or dose that is measured with substantial error may possess an error-free milestone, such that it is known with negligible error whether the value of the variable is to the left or right of the milestone. Such a milestone provides a basis for estimating a linear relationship between the true but unknown value of the error-free predictor and an outcome, because the milestone...

Journal: :The annals of applied statistics 2009
Dylan S Small Paul R Rosenbaum

A predictor variable or dose that is measured with substantial error may possess an error-free milestone, such that it is known with negligible error whether the value of the variable is to the left or right of the milestone. Such a milestone provides a basis for estimating a linear relationship between the true but unknown value of the error-free predictor and an outcome, because the milestone...

Journal: :The Journal of Cell Biology 1976
K S Bedi D J Goldstein

The Feulgen-DNA contents of human leukocytes, sperm, and oral squames were investigated by scanning and integrating microdensitometry, both with and without correction for residual distribution error and glare. Maximally stained sperm had absorbances which at lambdamax exceeded the measuring range of the Vickers M86 microdensitometer; this potential source of error could be avoided either by u...

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