search for: mussels

Hi, I am trying to assemble a three-way contingency table examining the presence/absence of mussels, water depth (Depth1 and Depth 2) and water velocity (Flow vs. No Flow). I have written the following code listed below; however, when run the glm I get the following message, "Error in model.frame.default(formula = Count ~ MP + wd + wv, drop.unused.levels = TRUE) : variable lengths differ (fo...

A quick question - is there a limit to the number of levels one can go down when setting the directory in R studio? I ask because I have been trying to set the directory to a folder 8 levels down which R studio won't allow, and when I try to set the directory through Session/Set Working Directory, it won't even show the lowest level folder: setwd("C:/Users/supermollusc/Desktop/151017

Hi there, I'm trying to write an R library (for Windows version) when I encountered this problem. I put in a dataset called mussels into a sub-folder, data (I saw this is how it is done in other libraries). However when I load the library in R and typed: data(mussels) it complains it cannot find the data set in the library. Everything else works fine (so far), am I missing something here? Thanks, Kevin ------------------...

I am using lattice to make figures as pdfs: trellis.device(device = "pdf",file = "Figure6.pdf",color = FALSE) I need to specify some blank space on the left-hand margins (the pages will be bound so we need about 0.5 inch)). I have tried a number of solutions but none seems to work (e.g. par.set). Can this be done when initiating the plotting device? Or is the some other way

Hi folks, We have a domain controller running Samba 3.4.5 that is backed onto an OpenLDAP datastore. The domain has no trouble joining Windows XP clients, but we've got a couple of Windows 7 / Windows Server 2008 R2 Standard that we can't join to the domain. The registry changes suggested in http://wiki.samba.org/index.php?title=Windows7&oldid=4766 have been applied, and a UNIX