search for: tavg

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2010 Feb 14
1
Adding a regression line to an xyplot
Hi R users > I am trying to add a regression line to a graph for "c" for factor 2 > only. Any suggestions? > library(lattice) a=(1:10) b=c(1:5,16:20) c=as.factor(c(rep(1,5),rep(2,5))) d=data.frame(a,b,c) xyplot(a~b, pch=c(6,8),data = tavg, groups=d$c, reg.line=lm, smooth=FALSE, type=c("p","g"),xlab="a",ylab="b") > I would appreciate your help. > > Kind regards > > andy > > Andrew McFadden MVS BVSc > Incursion Investigator > Investigation & Diagnostic Centres...
2010 Aug 16
1
need of elegant data manipulation
Dear R users, I seek for a more elegant manner to manipulate my data that that I produced so far. Data is in a data frame THC515.DATA -sample at the end of this mail- of 5 variables, a string and 4 continuous numeric variables. I need to get the mean of two variables "Q" and "T" at the levels of a third one "dP", individually for each level of "n". I