search for: benzen

Dear r-help, I'm having trouble formatting xy labels for plot in r. I want to make the following y-label "benzene (mug-3)" where mu is greek and -3 is superscript and benzene is held in an array. I tried this, myname = c("benzene", "etc") plot (c(0:10), ylab = bquote(.(myname[1])~~(mu~g ~m^-3))) but it leaves a space between the "mu" and the "g". Any suggestions?...

Dear Dennis, Your question assumes that people know both SAS PROC MIXED and R nlme. Only a limited number of people do. Add the mathematical formulation of the model. That will increase the number of people that can help you. Adding the number of levels in each categorical variable and the number of observation per group is useful too. Best regards, ir. Thierry Onkelinx Instituut voor natuur-

I am trying to reproduce some old SAS PROC MIXED code using R and nlme. The data consists of emission readings from vehicles and fuel properties. All variables are real numbers except "study" and "vehicle", which are character. Unfortunately, since the data are confidential, I'm unable to provide an example. The original SAS v6.12 code is provided below: