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http://krishi.icar.gov.in/jspui/handle/123456789/7572
Title: | Deletion diagnostics for the generalized linear mixed model with independent random effects. |
Other Titles: | Not Available |
Authors: | Ganguli, B Roy, Sen S., Naskar, M., n Malloy, E. J. Eisen, E. A. |
ICAR Data Use Licennce: | http://krishi.icar.gov.in/PDF/ICAR_Data_Use_Licence.pdf |
Author's Affiliated institute: | University of Calcutta, India University of Calcutta, India ICAR::Central Inland Fisheries Research Institute American University, USA University of California |
Published/ Complete Date: | 2016-01-01 |
Project Code: | Not Available |
Keywords: | Cook's distance; DFBETAs; deletion diagnostics; exposure-response; generalised linear mixed models |
Publisher: | Wiley |
Citation: | Not Available |
Series/Report no.: | Not Available; |
Abstract/Description: | The Generalised linear mixed model (GLMM) is widely used for modelling environmental data. However, such data are prone to influential observations, which can distort the estimated exposure-response curve particularly in regions of high exposure. Deletion diagnostics for iterative estimation schemes commonly derive the deleted estimates based on a single iteration of the full system holding certain pivotal quantities such as the information matrix to be constant. In this paper, we present an approximate formula for the deleted estimates and Cook's distance for the GLMM, which does not assume that the estimates of variance parameters are unaffected by deletion. The procedure allows the user to calculate standardised DFBETAs for mean as well as variance parameters. In certain cases such as when using the GLMM as a device for smoothing, such residuals for the variance parameters are interesting in their own right. In general, the procedure leads to deleted estimates of mean parameters, which are corrected for the effect of deletion on variance components as estimation of the two sets of parameters is interdependent. The probabilistic behaviour of these residuals is investigated and a simulation based procedure suggested for their standardisation. The method is used to identify influential individuals in an occupational cohort exposed to silica. The results show that failure to conduct post model fitting diagnostics for variance components can lead to erroneous conclusions about the fitted curve and unstable confidence intervals. |
Description: | Not Available |
ISSN: | Not Available |
Type(s) of content: | Research Paper |
Sponsors: | Not Available |
Language: | English |
Name of Journal: | Statistics in Medicine |
Volume No.: | 35 |
Page Number: | 1488-1501 |
Name of the Division/Regional Station: | Not Available |
Source, DOI or any other URL: | Not Available |
URI: | http://krishi.icar.gov.in/jspui/handle/123456789/7572 |
Appears in Collections: | FS-CIFRI-Publication |
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