Estimating Control Rates of Three Different Insecticides by Generalized Estimating Equation and Generalized Linear Mixed Model
Date Issued
2005
Date
2005
Author(s)
Tsai, Fang-Yu
DOI
zh-TW
Abstract
The aim of this study is to estimate the control rate of three bait-formulated insecticides of red imported fire ants.
Two field experiments were conducted, respectively,
in Taoyuan and Chiayi county where the red ant infestation were spotted and the three different insecticides applied are Fipronil,
Pyripronxyfen and Spinosyns.
Repeated counts of ant mound number in each field plot of size 100 $m^2$ were recorded by the researchers in the local agricultural experimental
station during the period of eight weeks.
Two statistical procedures were employed to analyzed these two data sets
and both are of generalized linear models.
First one is a GEE model and the second one is a generalized mixed-effects
model (GLMM).
The former is relatively easy however the later demands more effort to
determinea decent model.
The estimates of control rate resulted from GEE and GLMM are quite similar
though the standard errors are different substantially.
We recommend that the SE's due to GLMM be applied to construct relevant confidence intervals,
since variance structure of GLMM does have a better description to the variation of data collected.
One interesting result is that all three insecticides show remarkable consistancy in control rates
in the two experiment sites.
Subjects
廣義估計方程式
廣義線型混合模式
Generalized Estimating Equation
Generalized Linear Mixed Model
Type
thesis
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