نتایج جستجو برای: incorrect assumption of independence

تعداد نتایج: 21168075  

Journal: :Biometrics 2008
Tyler J Vanderweele

In a presentation of various methods for assessing the sensitivity of regression results to unmeasured confounding, Lin, Psaty, and Kronmal (1998, Biometrics54, 948-963) use a conditional independence assumption to derive algebraic relationships between the true exposure effect and the apparent exposure effect in a reduced model that does not control for the unmeasured confounding variable. How...

2007
Tyler J. VanderWeele

In a presentation of various methods for assessing the sensitivity of regression results to unmeasured confounding, Lin et al. (1998) use a conditional independence assumption to derive algebraic relationships between the true exposure e¤ect and the apparent exposure e¤ect in a reduced model which does not control for the unmeasured confounding variable. However, Hernán and Robins (1999) have n...

Journal: :Human heredity 2011
Elizabeth Thompson

There are three assumptions of independence or conditional independence that underlie linkage likelihood computations on sets of related individuals. The first is the independence of meioses, which gives rise to the conditional independence of haplotypes carried by offspring, given those of their parents. The second derives from the assumption of absence of genetic interference, which gives ris...

Journal: :Decision Support Systems 2013
Bahareh Bina Oliver Schulte Branden Crawford Zhensong Qian Yi Xiong

An important task in multi-relational data mining is link-based classification which takes advantage of attributes of links and linked entities, to predict the class label. The relational naive Bayes classifier exploits independence assumptions to achieve scalability. We introduce a weaker independence assumption to the e↵ect that information from di↵erent data tables is independent given the c...

Journal: :Journal of the American Statistical Association 1993
W R Bell

"Population estimates from the 1990 Post-Enumeration Survey (PES), used to measure decennial census undercount, were obtained from dual system estimates (DSE's) that assumed independence within strata defined by age-race-sex-geography and other variables. We make this independence assumption for females, but develop methods to avoid the independence assumption for males within strata by using ...

2015
Earl F. Becker Aaron M. Christ Aaron W. Reed

Distance sampling is a widely used method to estimate animal population size. Most distance sampling models utilize a monotonically decreasing detection function such as a half-normal. Recent advances in distance sampling modeling allow for the incorporation of covariates into the distance model, and the elimination of the assumption of perfect detection at some fixed distance (usually the tran...

2010
William Browne Harvey Goldstein

In this article, we discuss the effect of removing the independence assumptions between the residuals in two-level random effect models. We first consider removing the independence between the Level 2 residuals and instead assume that the vector of all residuals at the cluster level follows a general multivariate normal distribution. We demonstrate how this assumption can allow us to fit higher...

2000
Ken Johnston Elton Scott

This study investigates the extent of the contribution of the original GARCH model to our understanding of the stochastic process underlying exchange rate price changes, and examines if the movement of current research to GARCH type models exclusively is warranted. GARCH(1,1) parameters are calculated on a yearly basis and used to standardize the exchange rate price change data. Frequency distr...

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