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I'm not sure if this is a bug, or if I'm doing something wrong. =20 =46rom the worms dataframe, which is at in a file called worms.txt at =20 http://www.imperial.ac.uk/bio/research/crawley/therbook <http://www.imperial.ac.uk/bio/research/mjcraw/therbook/index.htm>=20 =20 the idea is to extract a subset of the rows, sorted in declining order of worm density, with only the maximum worm density from each vegetation type: =20 worms<-read.table("c:\\temp\\worms.txt",header=3DT...

Hello R-help, I'm studying an example in the R book.? The data file is available from the link below.http://www.bio.ic.ac.uk/research/mjcraw/therbook/data/fertilizer.txt Could you explain Why the results from lme() and lmer() are different in the following case? In other examples, I can get the same results using the two functions, but not here...? Thank you.Miya library(lme4)library(nlme)# object dat contains the data > summary(lme(root~fer...

Hi,) I am just getting started with R but have hit an early snag. I am working through Crawley (2008) The R Book and on page 6, 'Significance Stars', I am trying to enter the commands given. However, 'Gain.txt' does not seem to have been downloaded when I downloaded the R programme. I have searched for it in case it put it somewhere other than 'temp' but I cannot find it.

Hello Everyone,   Does anyone have the R code for this book? I contacted the author about this and was told that it used to be on the book's website, but that the publisher had asked that it be taken down. I'm hoping that someone will have downloaded the code when it was available, and that they will be willing to share it with me.   The book is almost 1,000 pages long and I'd like to

...ficant coefficients in the solution. I was surprised at this and want to know how I should choose the order of the factors, if the order affects the result. Here is the small example. It is taken from 'The R Book', Crawley p. 365. The data is at http://www.bio.ic.ac.uk/research/mjcraw/therbook/data/competition.txt In R > comp<-read.table("C:\\Temp\\competition.txt", header=T) > attach(comp) Data has dependent variable 'biomass' and different types of 'clipping' that were done: Control (none), n25, n50, r10, r5: > summary(comp) b...

Hello list, I'm trying to figure out how exactly the specification of nested random effects works in the lmer function of lme4. To give a concrete example, consider the rat-liver dataset from the R book (rats.txt from: http://www.bio.ic.ac.uk/research/mjcraw/therbook/data/ ). Crawley suggests to analyze this data in the following way: library(lme4) attach(rats) Treatment <- factor(Treatment) Rat <-factor(Rat) Liver<-factor(Liver) m1<-lmer(Glycogen~Treatment+(1|Treatment/Rat/Liver)) The problem that I have with this analysis is that Treatment...

Hello Everyone,   Learning about R and its wonderful array of functions. If it's not obvious, I usually try to find out what a function stands for. I think this helps me remember better.   One function that has me stumped is "sink." Can anyone tell me if this stands for something?   Thanks,   Paul         __________________________________________________ [[alternative HTML

I have data that looks like this: > df1 group id 1 red A 2 red B 3 red C 4 blue D 5 blue E 6 blue F I want a list of the groups containing vectors with the ids. I am avoiding subset(), as it is only recommended for interactive use. Here's what I have so far: df1 <- data.frame(group=c("red", "red", "red", "blue",