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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
IJCMAS is now DOI (CrossRef) registered Research Journal. The DOIs are assigned to all published IJCMAS Articles.
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2018: 95.39
For more details click here

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Original Research Articles

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2018.7(6): 1061-1072
DOI: https://doi.org/10.20546/ijcmas.2018.706.126


Extension of Basic Linear Mixed Effect Model to Incorporate Heterocedasticity
Nageena Nazir1, S.A. Mir1, Zahoor Ahmed2 and M. Iqbal Jeelani3
1Division of Agricultural Statistics, Sher-e-Kashmir University of Agricultural Sciences and Technology, Kashmir, India
2KVK Kupwara, Sher-e-Kashmir University of Agricultural Sciences and Technology, Kashmir, India
3Division of Agricultural Statistics, Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, India
*Corresponding author
Abstract:

The linear mixed effect model allows considerable flexibility in the specification of the random effects structure but restricts the within group errors to be independent, identically distributed random variables with mean zero and constant variance. In this paper the linear mixed-effects model is extended to include heteroscedastic errors. In this paper several classes of variance functions to characterize heteroscedasticity are introduced. We describe how the lme() function can be used to fit the extended linear mixed effects model and illustrate its various capabilities through examples. Also we will show the estimation and computational methods of simple linear mixed effect models can be applied to the extended model.


Keywords: Extension, Basic linear mixed effect model, Heterocedasticity
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How to cite this article:

Nageena Nazir, S.A. Mir, Zahoor Ahmed and Iqbal Jeelani, M. 2018. Extension of Basic Linear Mixed Effect Model to Incorporate Heterocedasticity.Int.J.Curr.Microbiol.App.Sci. 7(6): 1061-1072. doi: https://doi.org/10.20546/ijcmas.2018.706.126