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2011 Sep 13
1
mvpart analyses with covariables
...TMRT <- mvpart(abundance ~
.,factors,margin=0.08,cp=0,xv="1se",xval=nrow(abundance),xvmult=100,which=4)
where abundance is 4th root transformed fish abundance (103 species x 168
samples), and factors is the relief (high, medium, low profile, sand
inundated reef, flat), benthos (coral, sessile inverts, kelp, macroalgae,
seagrass, sand), depth (continuous in meters), latitude, and longitude of
each sample.
To try and incorporate spatial autocorrelation (as a covariate) into this I
have been trying the command -
ABUNDTMRT <- mvpart(abundance ~ environ + spatial,
data.frame,margin=0.08...
2008 Mar 03
1
Stepwise Multiple Regression
Dear R,
I am using stepwise multiple glm to select a subset of variables using the step command. My question is how do you calculate the percentage variance for each parameter in the reduced model. An example of my code thus far is,
fit<-glm(Abalone~offset(Area)+Sessile invertebrates+Bare rock+ NCA + Encrusting red algae, family = poisson ())
step(fit)
fit1<-glm(Abalone~offset(Area)+Bare rock+NCA+Encrusting red algae, family=poisson())
Thanks in advance
Beth Strain
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