similar to: Improper coding for an offset in vglm()?

Hello, I have a data set that needs to be combined so that rows are summed by a group based on a certain variable. I'm pretty sure rowsum() or rowsums() can do this but it's difficult for me to figure out how it will work for my data based on the examples I've read. My data are structured like this: Plot SizeClass Stems 12 Class3 1 12 Class4

Hello, I'm having trouble figuring out how to see resulting groups (clusters) from my hclust() output. I have a very large matrix of 4371 plots and 29 species, so simply looking at the graph is impossible. There must be a way to 'print' the results to a table that shows which plots were in what group, correct? I've attached the matrix I'm working with (the whole thing

Hi! I need your advice. My problem is that I have very bad sound quality calling to cellular phone via asterisk router. There are some kind of noises and echo effects when you try to speak louder. I have the following components in my call routing schema: - PBX with E1 port. - asterisk router with TE405P card(32bit/4 E1 ports). - Teles server with PRI interface card(3 E1 ports) and VTM

I keep expecting R to have something analogous to the =count function in Excel, but I can't find anything. I simply want to count the data for a given category. I've been using the ddply() function in the plyr package to summarize means and st dev of my data, with this code: ddply(NZ_Conifers,.(ElevCat, DataSource, SizeClass), summarise, avgDensity=mean(Density),

Hello, I am working with two different data frames, and I'd like to move data from one to the other. Here is the first frame: > head(five) Week Game.ID VTm VPts HTm HPts HDifferential VDifferential 1 1 NFL_20050908_OAK at NE OAK 20 NE 30 10 -10 2 1 NFL_20050911_ARI at NYG ARI 19 NYG 42 23 -23 3 1 NFL_20050911_CHI

Hello, I'm looking for what I'm sure is a quick answer. I'm working with a data set that looks like this: Week Game.ID VTm VPts HTm HPts Differential HomeWin 1 1 NFL_20050908_OAK at NE OAK 20 NE 30 10 FALSE 2 1 NFL_20050911_ARI at NYG ARI 19 NYG 42 23 FALSE 3 1