Re: [R] Multiple Paired T test from large Data Set with multiple pairs

If you have Sites with "ALA1", "ALA2", etc it would be better to do: lst1<- split(WrackMass,substr(WrackMass$Site.X.Treatment,1,4))  res1<-lapply(lst1,function(x) do.call(cbind,lapply(x[,1:4],function(y) {Site<- gsub(".*\\d(.*)","\\1",x$Site.X.Treatment);t.test(y[Site=="A"],y[Site=="U"],pair

Re: [R] Multiple Paired T test from large Data Set with multiple pairs

Hi, Still no data. >From your code, it looks like data is similar to this: set.seed(25) WrackMass<- data.frame(Algae.Mass=sample(40:50,30,replace=TRUE),Seagrass.Mass=sample(30:70,30,replace=TRUE),Terrestrial.Mass=sample(80:100,30,replace=TRUE),Other.Mass=sample(40:60,30,replace=TRUE),Site.X.Tre

Re: [R] Multiple Paired T test from large Data Set with multiple pairs

My code was based on the assumption that your dataset was similar to the one I provided.  Please provide an example dataset (use dput(head(dataset),20)) http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example A.K. >Arun, > >I have tried applying your suggestions t

Re: [R] Multiple Paired T test from large Data Set with multiple pairs

Hi, Assuming that your dataset is similar to the one below: set.seed(25) dat1<- data.frame(Algae.Mass=sample(40:50,10,replace=TRUE),Seagrass.Mass=sample(30:70,10,replace=TRUE),Terrestrial.Mass=sample(80:100,10,replace=TRUE),Other.Mass=sample(40:60,10,replace=TRUE),Site.X.Treatment=rep(c("ALA1A","A