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Can anyone help me understand why an lm model summary would return an r.squared of ~0.18 with an intercept term, and an r.squared of ~0.98 without the intercept? The fit is NOT that much better, according...

Hi all, what a great help list! I hope someone can help me with this puzzle... I'm trying to find a simple way to do: boxplot(obs~factor) so that the factors are ordered left-to-right along the...

Hello all, I'm trying to do a nested linear model with a dataset that incorporates an observation for each of several classes within each of several plots. I have 219 plots, and 17 classes within each plot. data.frame...

Dear all, I'm wanting to do a series of comparisons among 4 categorical variables: a <- aggregate(y, list(var1, var2, var3, var4), sum) This gets me a very nice 2-dimensional data frame with one column per variable, BUT...

Hello, all; I get an unexpected result when trying to plot a probability histogram with R1.9.1 on windows xp: #with the following code: > x <- runif(100,0,1) > hist(x) > hist(x, freq=F) > h <- hist(x, freq...

Hi all; Thanks for the responses to my query of how to make tapply into a table instead of an n-dimensional array. Summary of responses follows: Peter Dalgaard: as.data.frame(with(tmp,as.table(tapply(C,list(A...

Thanks, Phil! I've literally spent two hours on my own trying to find something that does exactly that. Thanks for another pair of functions added to my (slowly!) growing R vocabulary. -jlb Phil Spector wrote: > Joseph - > I'm sure...

Alec, Thanks for your reply. I guess what I'm getting at is that I to plot the histogram such that the HEIGHT of each bar represents the proportion of that class in the sample. From your reply I gather...

Profs. Ripley and Schwartz, Thank you both very much for the suggestions! These are exactly what I was looking for. I'll re-read the boxplot help yet again; every time I read it something essential worms its way into...