Displaying 2 results from an estimated 2 matches for "anitanarwani".
2010 Jul 08
2
Using nlm or optim
Hello,
I am trying to use nlm to estimate the parameters that minimize the
following function:
Predict<-function(M,c,z){
+ v = c*M^z
+ return(v)
+ }
M is a variable and c and z are parameters to be estimated.
I then write the negative loglikelihood function assuming normal errors:
nll<-function(M,V,c,z,s){
n<-length(Mean)
logl<- -.5*n*log(2*pi) -.5*n*log(s) -
2010 Jun 03
3
Nested ANOVA with covariate using Type III sums of squares
Hello,
I have been trying to get an ANOVA table for a linear model containing a
single nested factor, two fixed factors and a covariate:
carbonmean<-lm(C.Mean~ Mean.richness + Diversity + Zoop + Diversity/Phyto +
Zoop*Diversity/Phyto)
where, *Mean.richness* is a covariate*, Zoop* is a categorical variable (the
species), *Diversity* is a categorical variable (Low or High), and