Nonparametric Estimation of Correlation Functions in Longitudinal and Spatial Data, with Application to Colon Carcinogenesis Experiments

Nonparametric Estimation of Correlation Functions in Longitudinal and Spatial Data, with Application to Colon Carcinogenesis Experiments

In longitudinal and spatial studies, observations often demonstrate strong correlations that are stationary in time or distance lags, and the times or locations of these data being sampled may not be homogeneous. We propose a nonparametric estimator of the correlation function in such data, using ke...

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Veröffentlicht in:The Annals of Statistics. - Institute of Mathematical Statistics. - 35(2007), 4, Seite 1608-1643
1. Verfasser: Li, Yehua (VerfasserIn)
Weitere Verfasser: Wang, Naisyin, Hong, Meeyoung, Turner, Nancy D., Lupton, Joanne R., Carroll, Raymond J.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2007
Zugriff auf das übergeordnete Werk:The Annals of Statistics
Schlagworte:Asymptotic theory Bootstrap Colon carcinogenesis Correlation functions Dependent data Functional data Gene expression Kernel regression Nonparametric regression Spatial data mehr... Time series Mathematics Health sciences Information science
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520 |a In longitudinal and spatial studies, observations often demonstrate strong correlations that are stationary in time or distance lags, and the times or locations of these data being sampled may not be homogeneous. We propose a nonparametric estimator of the correlation function in such data, using kernel methods. We develop a pointwise asymptotic normal distribution for the proposed estimator, when the number of subjects is fixed and the number of vectors or functions within each subject goes to infinity. Based on the asymptotic theory, we propose a weighted block bootstrapping method for making inferences about the correlation function, where the weights account for the inhomogeneity of the distribution of the times or locations. The method is applied to a data set from a colon carcinogenesis study, in which colonic crypts were sampled from a piece of colon segment from each of the 12 rats in the experiment and the expression level of p27, an important cell cycle protein, was then measured for each cell within the sampled crypts. A simulation study is also provided to illustrate the numerical performance of the proposed method. 
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700 1 |a Carroll, Raymond J.  |e verfasserin  |4 aut 
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